In every school bus I've ridden on, two windows pop out as emergency exits, the rear door is an emergency exit, and there is at least one on the roof (in case the bus tips over). Buses are perhaps the easiest of all vehicles to evacuate in the event of an incident (except maybe motorcycles).

That's some good FUD right there.

EV battery fires don't just spontaneously and instantly burst into an all encompassing flame that destroys, maims and kills everything near it.

If it does catch on fire they will be able to evacuate. There are always at least two exits on the bus, and the windows can be used as well.

Basically, it would very similar to a standard bus fire, with the exception that it takes longer and different tactics to put out an EV fire.