No way, you should have another look. Make sure your battery isn't getting really hot after you run your car for a bit. I don't think you found the cause, and that would concern me.

 

Any loose metal in the back, like a socket or a wrench or something that could've possible sparked as it hit some metal in the car going over a bump on the road? Does what I just said make any sense?

 

Oh OK, reading your first post gave me no indication as to your skill level. I think the vents you are referring to are for the fresh air extraction system, the cabin pressurizes with the climate control on and cabin air has to escape a closed-up car somewhere. Not the source of a flashpoint for sure.

Absolutely I have not heared of anything like that, and hopefully you will get some additional input. I would be busy playing XJR CSI.