This thread goes on and on
But, the right answer is staring you in the face if you have seen the vids, inside and outside.
Dont tell me the RFF said stay put, we will control it, when they were driving away from the burning a/c to stay on tarmac. No way.
The pilots can use the tail cam. Even the tower could see it from afar (hence the fire crew without request). And as the FC has legs, they can eyeball the situation any time they want to.
So sorry, no excuses. Bad call. Lucky escape.