I'm wondering. I actually wanted to make people explode in my map at a certain area after a certain action, but the common damage types a trigger_hurt offers to me seem to be silly remains from Half-Life 2 Beta developement. I've never really seen a difference between the damage modes. Now there's a possibility to do it via point_clientcommand. However I don't know if this effects all players or just the player who triggered the point_clientcommand.