I should point out that considering the speed we're working at, avoiding my character's shots by sound would be a poor method of avoidance, considering sound is slower than light, he'd have an easier time just seeing Metz fire.

What I'm saying is that if he's relying on hearing to avoid the shot, he couldn't have escaped the bullet that easily. 

Also if his hearing is that sensitive you probably should have said something about how loud the massive pistols firing in his hands were.