Just to add, ground idle is about 70% N1 and it takes less than 50% N1 for the fire bottle to actuate. If the gas turbine was still turning above 50% then the bottle would not fire. The emergency switch would only close the fuel shutoff valve in that scenario. And the fuel valve is located about 1 foot below the engine deck on the sidewall next to the aft incline frame where the clam shell hinges are mounted.