If we suppose that Tesla has the ability to charge and discharge individual cells, then perhaps there is a software mitigation strategy to a battery fire. Presumably a foreign object causes a short in the pack. This short generates heat, that overwhelms the temperature management in a few minutes (boil away the fluid?). What if the software chose to discharge the cells in a wide ring around the anomaly, into the rest of the pack. It could then try to discharge cells in successively smaller rings. The idea is to deny power to the vicinity of the problem. A fire line, of sorts. The shifting of the charge itself would generate heat, but it would be over a wider area (which would presumably be less likely to boil away the fluid). And then once the ring of discharged batteries is established, presumably it would limit the ability to spread beyond the initial point of battery damage. Even if the cells are individually charge/dischargable, I have no idea whether this theory would work in practice. It just seems worthy of investigation. After all, the earliest hard disks had to be perfect. But over time, manufacturers learned how to deal with failure. Modern HDs are in a constant state of failure and reconfiguration.