"Hey, why not bulletproof?" Because by taking cover, you take no damage instead of any damage. Also, if you're careful, you can't get killed by bullets anyway.It takes two shots all the way to level 50 to knock you down from critical. Backfire is good for infected and walkers, because if they hit you while you're in mid-air or while your back is turned in the middle of the kick, you'll get knocked down. This is a little revenge.
