Are you sure about the mod bit? I'd be surprised if there wasn't some clause in every contract that says something like "does not cover loss due to improperly installed aftermarket parts" or something.
As for the extinguisher, it would have almost been better if he didn't try to put it out at all. He could have then said he didn't have one in the car, and couldn't find one nearby.
Who knows, though. I'm just talking out of my arse at this point.
