What happens if Cold Fusion goes critical.

if there was terrorist attack, sabotage, or just plain accident wat happens to the cold fusion reactor. does it just suddenly stop? and we can restart the reactor. does it stop and the cold fusion disappears after losing its 100 million degree temperature.? does it blow big, like a supernova!! or just kaboom and just blows up the building its housed in.

I don't think there's any notion of "supercritical" in thermonuclear reactions, that only exists in the mass of fissible isotopes of uranium and plutonium etc.

I imagine if a device that conducted controlled fusion of hydrogen was destroyed, the hydrogen would simply stop fusing...no nuclear explosion or anything like that.