i dont think there even is an animation for getting up from being dead is there?
the only way it could be done is setting an eventhandler for everyone, then when they are hit, it sets the units damage back to 0 and then a dead animation ensues. but to get the unit up again, the unit would have to be deleted, then recreated on its position, the problem with this though is that it might be tricky to get it to work on only one weapon.
make sure the weapons only dus about 1 damage through, so that even head shots dont kill.