I had a positive sabotage threat as a new captain on a 737 200 one day landing at LAX with a new hire FO. We asked for air stairs in flight and again on the ground but got no air stairs so used all 4 slides. I hated to do it but had no choice.
The fire trucks were there and assisted us with the firemen assisting each passenger get off safely at the bottom of the slide.
We would have had injuries if they hadn't assisted. They did the right thing by waiting with their situation.