Or if Grav wanted to, he could make a playertype that when there health gets to 0, they tumble and fall over, and they can't take any more damage, but if they are hit with the Defib they stand back up with full health or something.
Like, you get killed and tumble/fall over, you can't move and you are basicly "dead". Some guy comes over with a defibrillator and shocks you back to life, and you stand back up.