I don’t know if they didn’t hit it with foam. Only so much foam can be carried by these fire vehicles. Maybe they exhausted all their foam and then just kept water on it. I dunno.
We carry 40 gallons of foam that is injected into only a few of the discharges at a user settable rate recommended to be 0.3% by volume.
The purpose of foam is to reduce surface tension on the water in order to get it deeper into the the seat of the fire (ex. putting out burning hay) and to lay a blanket of foam over the fire to deprive it of oxygen and whatever cooling effect that you can get.
In a thermal runaway battery fire, I don’t see where foam is necessarily going to be a benefit.
We have a large handheld ABC dry chemical and a CO2 extinguisher.
Probably the only thing that might actually do anything is a Class D extinguisher and that would come from another department or perhaps the airport.
Fact is, if you are trapped in a burning EV, you best self extricate or make peace with your maker because the tools are not readily available enough for me to contain the fire enough to get you out alive. So it is living on the bleeding edge of technology.