I have been testing this with 2 other players, It seems that I can't damage them and vice versa, Even after messing with /grff and turning it on/off. Might have been a sync issue? Because sometimes explosion damage can be dealt with as an unknown damage source that won't trace back to any attackers just like a vehicle exploding near you. Can you redo this test? If any damage occurs, Please check /actions and show me if the logs read who attacked who.