I thought I heard that water is a terrible way to put out lithium fires; in fact, like cesium, it's more volatile in water ...

You need a special foam to put out lithium fires, just as with electrical and chemical fires.

(Maybe I should go ask the smartest people in the universe about that. Oh, wait, they blowed up real good. 😹 .... Gee, maybe humans will be next. If you believe that the irish elk went extinct because of its own antlers, well, humans fuck themselves with their own tech all the time. And boy, does it wear well on 'em.)