"Who said anything about the flame climbing back?  

I've ignited hairspray.  I even remember when Right Guard deodorant came in a spray can (yea, I'm OLD).  I remember the Right Guard especially, since it wasn't uncommon in my college dorm to have a 2-3 foot flame shoot through the door vent from someone standing outside and igniting their Right Guard spray.

BUT, neither of these were BEAR SPRAY"

don
t forget your Off or whatever - bug spray will also ignite