You don't know how guns work in this game, do you? There are two separate projectiles in this game, as in most shooters. One is a projectile that is invisible and instantaneously hits your target, since this game has no bullet travel time on snipers. The second is a visible projectile that we can see. It does no damage and has travel time. These two rays do not always got to the same place. Often times, they separate, since the damaging projectiles is fired from your head and the non-damaging one from the gun. The one you saw not hit was just the non-damage shot.