I've found that when you manage the raiser your PL to 1 billion or above, melee actually begins to heal the person you hit, looks kinda strange, cuz the bar starts going outside of the little gray box that the health bar is supposed to stay within 
(I have some screenshots if you want proof, but I don't have a place to host them so... yeah). Anyways, I didn't think this was extremely important, seeing as how you usually don' t get that high, but thought you might wanna know anyways.
(I have some screenshots if you want proof, but I don't have a place to host them so... yeah). Anyways, I didn't think this was extremely important, seeing as how you usually don' t get that high, but thought you might wanna know anyways.