This actually happened to me and my brother bobby all the time, of course, it was alittle different for us....i'm sure you all know what chiron is....well if you throw a plasma grenade and then you leave the room, it won't explode untill someone enters the room. We called it mining because whenever someone would step through the wrong teleportor they'd die....how this relates to the gaurdians? Well usually we die before the mines blow someone up so when the grenade goes boom, well the gaurdians score. BTW, when you get hit with an explosive if you watch yourself on another player's screen it kind of turns you sideways in midair, that causes the rocket to fly in a different direction.