Our company had a tug fire (while attached to the aircraft) about 2 years ago in BHX ...
The big, hard, no neck ground crew (Aviance) dropped the headset and ran away !!
At no point did any of the ground crew make an attempt to discharge the tug fire extinguisher.
About 6 of the 'loadies' then stood at a distance in a group having a chat and a laugh about it ...
In the meantime, the skipper (who had doors closed with a full load of pax), waited for the fire service to arrive ... between them, they initiated an 'de-plane' via the rear steps.
The only thing that prevented serious damage to the aircraft, was the flight crew on board the company aircraft on the next stand. They grabbed a couple of BCFs from their own aircraft, and attempted to put out the fire.
And we trust these guys every day to help us out if we have an engine fire on startup !!?!?!?