Not entirely sure if this is a bug or intended, but while doing IMF Abandoned Assembly today, in the bomb alley on the right side where all the bombs spawn when you step on the party button and you get a constant stream of rockets from the top, I noticed that one of the red bombs next to the party button spawned already in the blinking detonation animation, and exploded shortly thereafter, without getting hit by a rocket or player. (I was shielding at the time, so I couldn't have hit it, and the rockets didn't hit the bombs until a second later)