EDIT: Holy shit. This could be used to put an end to db on foot. It can be used to determine whether the player who dealt damage was in a vehicle, and prevent the damage from being translated to the player. It could be used to end deathmatching as a whole (if you wanted to go crazy about it). You could determine whether the player who shot was raped, robbed, kidnapped, etc in the time limit, if he was not, the other player simply does not take any damage. Same with cops, if the player is white/yellow, no damage is taken.