Negative Damage?

I am curious if there is a way to accomplish it using the resource hack and if someone would be willing to help

I actually did that 7 months ago. If youu set the Damage negative, it will heal your opponents.
Everyone thought, that other persons hacked, because they couldn't be killed.

I was the only Hacker in the room and nobody thought, that I was the hacker xD

P.S.: Too good, that I quit hacking 6 months ago...but I still need those 3d modells from S4 ;P