The problem is the massive heat spike caused by the full auto mayhem has resulted in the control mechanisms starting to melt and jam. Internal pressures are already near the breaking point as the coolant pressure increases. Trax managed to stabilize the reaction, but the coolant pressure is going to exceed the limits of the device shortly.
There's going to be a big kaboom.
Nothing earth-shattering or anything, but it'll leave a fairly large crater and take out most of the upper floors of the building you're on.