I like to think that most SOP's have evolved due to experience or lesson learned. If the fire goes out during the drill and the full procedure is not carried out, isn't it the same as just pulling back the throttle lever to see what happens? When we complete the drill and do the checklist, it's called securing the engine. We can let the mechanic and or TSB figure out what happened to it after we land. Our duty is to get to the hotel in one piece and have our just deserved beer.