Didn’t the cop know that the taser was electrical and electrical makes sparks and sparks could...perhaps...ignite the stupid idiot who doused himself with a flammable substance?
Sheesh...don’t they teach science anymore?
I’d bet it was an emergency and the cop was afraid the guy would set himself alight, and kind of instinctively tasered him to stop him.
I doubt the cop had time to stop and think about whether tasering the guy would be a good idea. Hindsight being 20/20 and all.