I know that most grenades in this game are used for zone and corridor control but I think it defeats the purpose of a trip mine to give away its position with loud beeps and flashing lights. Wouldn't it make more sense for this to be used in ambushes? I mean, it's meant to be a trap, after all. EDIT: When I said 'Invisible' I didn't mean completely invisible. The physical part of the grenade would have to be visible, at least. And maybe have a pulsing light on it. But, no, not completely invisible. I was referring to the red light coming from it. I've changed the title of this to make it more clear.