I agree it’s a possibility.
But wouldn’t this be a fairly common outcome in wrecks where the headlights and radiator are involved?
I really don’t think it is. I asked my buddy who’s an EMT in the city and sees wrecks all the time and he says he’s heard of it.
In the case of the garage accident, I suspect an aggravating factor was the confined nature of the space - even if the garage door were open (not sure if it was), the roof and three walls of the garage would have served to concentrate any flammable spray/fumes.