Two quick items:
At Kegworth, the pressure vessel was ruptured, thus thrust went to zero (almost) instantly. Performing the shutdown checklist would have had no effect on thrust. Further, it was the secondary damage (fuel spilled) that caused the disaster.
Secondarily: Is there any case in which the fire handle should be pulled without a fire indication? It's been a long time since I had a FCOM or QRH handy - maybe someone can fill this blank for me.