If you miss the headshot you're done. There are multiple ways to avoid getting shot in the face by that gun. The one way that doesn't work, at least until Tuesday, is to stand still and shoot at the sniper. I wouldn't call NLB/sidearm a crutch, so much as the most effective way to have a long distance/close quarters option given the change to special ammo. It's just the way it is right now.