ok so i found this little exploit which allows u to fight other ppl without getting hit.
1. find a wal, cliff, ect, thats roughly on a 90 degree angle.
2. get on the very edge just before u fall so most of your body is hanging over and u got 1 foot left on ledge.
3. profit
what happens is, to everyone else, u will be standing at the bottom fighting, but u will actually still be standing on top killing the player and not taking damage.
Enjoy