I've been baffled by this technique ever since Kakashi first used it against Deidara. How much chakra does it actually take? How quickly can he warp someone or something away with it?
This latest chapter answered both questions.
As shown here, Kakashi states he believes he's accumulated the right amount of chakra to warp away the Gedo Mazo statue:
What does this tell us? Well, obviously, it tells us he can control how much chakra he puts in to his kamui. At this point, he could probably put all his chakra in to it and warp it away instantly, if needed(that, of course, being if kamui actually worked on Gedo Mazo, but that's beside the point here). But he knows 1. Gai, Naruto and Bee are buying him time to warp it away, so he doesn't HAVE to use all of it and 2. If it does fail(which it ultimately did), he'll still have chakra left to keep fighting and 3. Tobi is still there, and is still a danger, Gedo Mazo or not, so now is not a good time to collapse and need to be carried back for medical attention.
Later on in this same chapter, we see him instantly warp away his "raikiri kunai":
Now this isn't as easy a task as it noramlly would be, because he has to put a little extra chakra in to it to warp it away instantly, as he worries about it hitting Naruto. Not much, but still a little extra than what he would likely use on such a small object.
Going back to the point I made earlier about him putting all his chakra in to it to warp something away immediately...during his fight with Deidara, he used the technique while Deidara was in the air flying, and only managed to get his arm. Now, we know at this time, he had issues controlling the area of what he warps(in other words, couldn't aim it properly), but that does not change the speed of which he can warp something away. You're probably wondering "well, when he did have it on Deidara, why didn't he instantly warp it away?". That's explained by the fact that Sakura and Chiyo are by themselves fighting an akatsuki member, and he knows Team Gai is held up, so not only does he have to worry about Deidara, but at that time, he's also worried about getting back to Chiyo and Sakura to assist them. Now, how do I know he could warp something away instantly?
Because it's shown not too long afterwards. As you probably know, Deidara used a clone of himself and decided to blow up and take them all out. We see here that Team Gai is just about to get caught up in this explosion, as Neji notes that it's too late for them to escape:
So how, exactly, do they manage to live? Well, we know that Kakashi warped it away...but what allowed him to do it so quickly? He used practically all the chakra he had left to warp it, which allowed him to warp it instantly. We see here how Kakashi has practically no chakra left after doing so:
Now, you might still be thinking, even after all this proof/evidence "well, Kakashi just got lucky, and managed to get it in time". That statement is later proved wrong. How is that, you ask?
Well, during his fight with Kakuzu, he states if Naruto, Yamato and co. didn't arrive in time, he would have used his mangekyou to warp Kakuzu away:
Some wonder why he's so confident that he could have done it. Well, now we know what he was talking about. It would have took all the chakra he had left, given how much of it he used prior to that, but he could have instantly warped Kakuzu away at that point, thus, ending with him in the hospital bed, just like he comments to Naruto, Sakura and Sai.
Is that STILL not enough proof? Well, there's another instance that proves this to be true, which is during the fight with Sasuke. As we see here, he instantly warped away two Susannoo arrows:
Luckily for Kakashi, he had yet to do anything prior to this in this fight, short of a little taijutsu altercation. However, we still see that him having to warp it instantly drained a good bit of his chakra:
Not too long after this, he comments that he's going to warp Tobi away:
He tells Sakura to watch over his body. Now, why is this? Just before this, he knocked Sasuke away, and was more than confident that he was going to be able to kill him. Well, this is because he's going to use the rest of his chakra to warp Tobi away instantly, leaving no room for escape. He's already seen with Deidara that if he takes his time, it's possible for someone to escape. He doesn't make the same mistake twice.
This also explains how Kakashi is still fighting after using the mangekyou/how he didn't experience the same physical strain as he did after warping the susannoo arrows away, and that is the fact that he can control how much chakra he puts in to the technique(he put the absolute minimum needed to warp the Gedo Mazo's head, as he commented on that), which controls how quickly he's able to warp something away.
This confirms everyone's question..Is Kakashi capable of warping a person away, even if moving?
Yes, he is. He can do it instantly, it would just drain his chakra to the point that it renders him unable to fight for a period of time(or if he's low on chakra, he's hospital bound), and thus, we now know how exactly Kamui works.
This latest chapter answered both questions.
As shown here, Kakashi states he believes he's accumulated the right amount of chakra to warp away the Gedo Mazo statue:
You must be registered for see images
What does this tell us? Well, obviously, it tells us he can control how much chakra he puts in to his kamui. At this point, he could probably put all his chakra in to it and warp it away instantly, if needed(that, of course, being if kamui actually worked on Gedo Mazo, but that's beside the point here). But he knows 1. Gai, Naruto and Bee are buying him time to warp it away, so he doesn't HAVE to use all of it and 2. If it does fail(which it ultimately did), he'll still have chakra left to keep fighting and 3. Tobi is still there, and is still a danger, Gedo Mazo or not, so now is not a good time to collapse and need to be carried back for medical attention.
Later on in this same chapter, we see him instantly warp away his "raikiri kunai":
You must be registered for see images
Now this isn't as easy a task as it noramlly would be, because he has to put a little extra chakra in to it to warp it away instantly, as he worries about it hitting Naruto. Not much, but still a little extra than what he would likely use on such a small object.
Going back to the point I made earlier about him putting all his chakra in to it to warp something away immediately...during his fight with Deidara, he used the technique while Deidara was in the air flying, and only managed to get his arm. Now, we know at this time, he had issues controlling the area of what he warps(in other words, couldn't aim it properly), but that does not change the speed of which he can warp something away. You're probably wondering "well, when he did have it on Deidara, why didn't he instantly warp it away?". That's explained by the fact that Sakura and Chiyo are by themselves fighting an akatsuki member, and he knows Team Gai is held up, so not only does he have to worry about Deidara, but at that time, he's also worried about getting back to Chiyo and Sakura to assist them. Now, how do I know he could warp something away instantly?
Because it's shown not too long afterwards. As you probably know, Deidara used a clone of himself and decided to blow up and take them all out. We see here that Team Gai is just about to get caught up in this explosion, as Neji notes that it's too late for them to escape:
You must be registered for see images
So how, exactly, do they manage to live? Well, we know that Kakashi warped it away...but what allowed him to do it so quickly? He used practically all the chakra he had left to warp it, which allowed him to warp it instantly. We see here how Kakashi has practically no chakra left after doing so:
You must be registered for see images
Now, you might still be thinking, even after all this proof/evidence "well, Kakashi just got lucky, and managed to get it in time". That statement is later proved wrong. How is that, you ask?
Well, during his fight with Kakuzu, he states if Naruto, Yamato and co. didn't arrive in time, he would have used his mangekyou to warp Kakuzu away:
You must be registered for see images
Some wonder why he's so confident that he could have done it. Well, now we know what he was talking about. It would have took all the chakra he had left, given how much of it he used prior to that, but he could have instantly warped Kakuzu away at that point, thus, ending with him in the hospital bed, just like he comments to Naruto, Sakura and Sai.
Is that STILL not enough proof? Well, there's another instance that proves this to be true, which is during the fight with Sasuke. As we see here, he instantly warped away two Susannoo arrows:
You must be registered for see images
Luckily for Kakashi, he had yet to do anything prior to this in this fight, short of a little taijutsu altercation. However, we still see that him having to warp it instantly drained a good bit of his chakra:
You must be registered for see images
Not too long after this, he comments that he's going to warp Tobi away:
You must be registered for see images
He tells Sakura to watch over his body. Now, why is this? Just before this, he knocked Sasuke away, and was more than confident that he was going to be able to kill him. Well, this is because he's going to use the rest of his chakra to warp Tobi away instantly, leaving no room for escape. He's already seen with Deidara that if he takes his time, it's possible for someone to escape. He doesn't make the same mistake twice.
This also explains how Kakashi is still fighting after using the mangekyou/how he didn't experience the same physical strain as he did after warping the susannoo arrows away, and that is the fact that he can control how much chakra he puts in to the technique(he put the absolute minimum needed to warp the Gedo Mazo's head, as he commented on that), which controls how quickly he's able to warp something away.
This confirms everyone's question..Is Kakashi capable of warping a person away, even if moving?
Yes, he is. He can do it instantly, it would just drain his chakra to the point that it renders him unable to fight for a period of time(or if he's low on chakra, he's hospital bound), and thus, we now know how exactly Kamui works.