A normal attack is the equivalent of only drawing the bow back enough to reach the target, whereas the Snipe attack is the equivalent of drawing the bow back as far as it can.Still don't understand your logic.
There's no noise, the arrow magically disappears and it's impossible to trace the trajectory, and the enemy suddenly gets mild amnesia. Those are the characteristics of this attack?
I've never shot a bow, so please explain to me the difference between this skill and a normal attack from the same bow.
While it isn't completely silent, that doesn't matter as much with enough distance.
Trajectory is only an issue if the enemy is currently looking in your direction.
Forget about the amnesia part, just apply game/fantasy logic.