“Flame annealing”, another favorite of mine.
Folks, there’s no such thing. And for my proof, let’s look at a typical kiln annealing cycle for soft glass:
Hold at 960 F for 1 hour
Drop to 850 F over 30 minutes, hold for 10 minutes
Drop to 500 F over 2 hours
Drop to room temperature over 2 hours
I don’t know anyone who can do that on a torch. Some folks do what they call “flame annealing”, but in reality, they are equalizing the temperature of the piece before allowing it to cool, so that all the parts are of an equal temperature to reduce the possibility of heat stress fracturing.