I say this is attempted murder.
Meh. It is an idiot with a spray can.
Isobutane is the propellant in an awful lot of products, and it burns nicely.
If it was shooting a stream of burning liquid, it would be a flamethrower (invert the can if the product burns).
We used AquaNet blue for spud gun propellant a long time (20 yrs) ago. This display looks impressive to the camera, but someone with a pick handle could have stopped that in a heartbeat if they were so inclined. I'd be far more afraid of a bottle with gasoline and a lit rag in it than that thing.
I am not advocating violence from anyone, just pointing out some facts.