> Once it is isolated, let it burn out if it reignites.
Mere words do not quite convey the issue.
How does one "isolate" a car? Does one take it somewhere? Where? Are fire engines able to undertake this task? It's there a concern en route to the somewhere?
You tow it away while it's on fire? I'm wondering if that's even possible. You can spray the vehicle w/ foam and then cover it and then maybe you could move it w/o reignition? Seems kinda risky / might require enclosed tow trucks w/ on board fire suppression? Then there's the question of where you put them once you move them. It's my understanding that they basically need to be allowed to burn (off gassing toxic chemicals) or submerged in liquid for extended periods.
There have been some pretty horrendous chain reactions of EV fires in China. I'm not sure storing a bunch of already defective ones in various states of burn together is safe at scale.