Kefa: yes sensei I do understand, the mist is to conceal the user, confuse/diver the attention of the opponent, even when the mist is released all isn't safe, the user still has 2 be quiet as the opponent could use an impulse attack reaction when he hears a sound!Yes, I'll explain to you about an opponent's field of vision.
Knowing where your opponent is looking at all times is extremely important. If they're focused upon something due to a distraction that you purposely created (say, by tossing a kunai into the air), then you can then pull off another trick on them.
This is especially important when facing Doujutsu users like the Byakugan, because it only has one blind spot, and it's important to be able to strike them from a vulnerable position.
Running away is a very nice way to do that. xD Haha, I want to do in a fight next time.
Also, you must remember to state that whatever you do is really quiet as when your eyesight is obscured, the other way to get information is through the ear. Be quiet in what you do in this mist.
Do you understand?
Good luck with your running away silently xd