Headshots are absolutely broken w/ the new helmet armour system in DayZ right now (This is Experimental)
At least, make you go unconscious after being shot in the head, with a helmet on!!!
Seems like an armour system as body shots register almost fine, but could be hit registration as certain occasions it takes way too many shots (Like in the clip before, but can be point-fire spread)
Helmets like the motorcycle helmet or any helmet really should not tank and withstand multiple 5.56mm rounds to the brain from an M4A1, but kill you in 1-2 shots to the body.
This makes it absolutely pointless to go for headshots.
The only helmets that should only save you from one shot, but still damage you, is an armoured ballistic helmet
in this instance with the clip below, he has a skate helmet!