This is video evidence that teaming is an actual problem. One suggestion to start with is obviously make it single combat. To prevent boxing a friend so that those two players can't just survive until there's nobody else, I suggest having a few time stages where constant typeless damage is given to all of the players remaining, gradually increasing until it's just a matter of time before players are forced to eat food, and fight to the last man standing. With the current addition of the instant death of not being in combat (to prevent hiding) I suggest that there be a reasonable time before that death, due to two players who might end up boxing into the typeless damage phases of the match leaving one player left unable to fight anyone. One way around this is to make it to where when the amount of players alive is an odd number (one person won't have a fight) then the instant death is inactive. If two teams of friends are boxing into the late stages of the typeless damage phases, it will come down to a matter of who can heal the most. Eventually the damage will be too harsh to out heal.