It seems that a human can't dodge a bullet once it is shot. That has been made rather clear by the articles I read.
But is it possible (in a story context of course, I'm not trying this IRL :p) to dodge a bullet by looking at the direction the gun points at ?
I'm currently thinking of this situation :
Person A is that character.
Person B can shoot projectiles with a gun-like tool at 200m/s (650fps), and stands at 10 meters of person A.
Could Person A have good enough eyesight to see when and where Person B will shoot with human abilities ? With training ? With better than normal eyesight ? Can it ever be a 'reliable' technique or would it need really favorable circumstances ?
First Edit : Or by using drugs ? I don't know if there's any that could temporarily improve your eyesight ?
Second edit : Maybe I wasn't clear enough. I meant to say that A sees B pull out the gun and have the time to try to move out of the gun's way.
Fifth edit : Okay let's be a little more specific than the fourth edit : would a close to zero reaction-time be enough to dodge the projectiles ? (and yes this is addressed in the answers)