They must have seen the "aerosol" can, which in modern times (now, since late 70's) use flammable propellants (due to SUPPOSED ozone deteriation from fluorocarbon propellant) for aerosols.
Back then when these were produced, most aerosol cans used non-flammable fluorocarbon propellants.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !