>>211579136not only was your attempted correction incorrect, but your proposed changes were as well.
"jay himself also caught fire" is a perfectly valid and grammatical sentence in english, using "himself" as an emphatic pronoun to highlight that jay, too, was affected by the fire. (not just the car or the garage).
the proposed change, "jay also caught himself on fire", while grammatically correct, alters the meaning by implying that jay accidentally set himself on fire, which is not necessarily what the original context intended.
You were wrong with complete confidence.