Was asked to post here...I'm noob sensei, so whateves. Now Before I post, know this is how I view the tf of your little skirmish.
Xeric pulls out flash bomb then Guts takes out kunai.
Xeric drops flash bomb
Guts covers his eyes in response to flash bang as Xeric throws kunai slightly after.
Guts throws kunai in response to your kunai.
World Shaking
The rest of Shiki's move
[FONT="].
He was seven meters apart, the fight would be all out. Mugen threw a flashbang behind his back and threw two explosive kunai into the air in an arc. The two kunai would then strike down on the opponent from above[/FONT]
Watching as the ninja reached into his pouch and grabbed something out, not knowing what was in his hand Guts immediately drew two kunai from his own pouch. Watching as the item was thrown behind the man, Guts assumed it would be a flash bomb.
Now main issue. Can Guts block light.....Yes, if you cover your eyes, you can block light. LOL, not an issue. Now can he see you? I'd say no. At the most, he would probably would see a dark silhoute of yourself, but I doubt it. He is covering his eyes, even while peaking would not help him view you if you are hidden within the light and behind his hand.
Watching as the ninja reached into his pouch and grabbed something out, not knowing what was in his hand Guts immediately drew two kunai from his own pouch. Watching as the item was thrown behind the man, Guts assumed it would be a flash bomb.
NOTE: Shiki responding to Xeric reaching in his pouch by taking out two kunai (the perfect amount of kunai needed for the rest of Xeric's move) and placing hand in front of his face after assuming the item is a flashbomb is a little metagamy. I think it would be allowed, since your bio would have no idea what was going to happen, and is tactic probably seen before. Howeverm it is prone to sensei opinion and more likely to get your opponent to check. I'm fine with it tho, as I've seen people act very paranoid in NW, and in battles.
Can he see the kunai? You throw your kunai in an upward ark seven meters away from him so that they strik him from above. With him blocking the light (still peaking just a little bit) I think the arc you threw them in would make it more than feasible for Guts to notice the Kunai flying from your position at that range. (its worthy to note, that while it is indeed blinding, it is by no means illuminating the entire battlefield. Just noting that in case you think it would still cover the kunai position.) So yeah I think since the kunai travel upward, the light (which is now mostly blocked) has less of an effect of hiding the kunai as the light would be more effective if guts had to focus his vision into the light. Standing mid range from you he would see kunai flying into the air out of the light.
It was a good tactic, but not good enough to fool Guts. He then quickly raised his left hand, blocking the light from his eyes while also keeping his eye peaked around his hand just enough to catch a glimpse of his enemy throwing the kunai into the air, Guts then quickly threw his two kunai into the air, clashing with the two Mugen had thrown and rendering them useless.
EDIT: Shiki's wording says he just manages to see Xeric throw the Kunai. Hmmm I thought about this and decided that its vague enough to actually save him. If he sees Kunai in the air coming from your position, he can say/surmise that he saw you throw it. No he didn't literally see you put the kunai in your hand and throw it, but I personally didn't feel that it had any bearing on the fight or integrity of the move. He threw his kunai once Mugen kunai were in the air, so I think the move stands. Now it is worthy to note, if he specifically stated he saw Mugen throw it (which you would be unable to do) it could have canceled out that move since the statement would be invalid thus void. I just made a personal decision that this was good nough.
After the kunai are thrown upward Shiki would counter with his own, unless you think you can throw kunai and channel chakra underneath him before he can begin to counter them. SOO, after he counters the kunai, you shake the earth, and then he tries to throw the barrages of kunai (6), he would be unable to attack specific areas of your body as the ground is now shaking so his accuracy takes a major hit. Then the telegram flash goes through if you don't sufficiently interrupt. I believe I got most of this right, or close enough. This is a BA fight with no stipulations so try to have fun and sharpen your skills. Plz forgive my noobness