LJ Idol Presents:

I guess Gary means "Face-Heel Turn" with the prompt, though I could argue that he could also mean "Heel-Face" Turn...

For those who don't have a clue, these are terms from the world of American Professional Wrestling, which since at least the Late 20th Century has involved the wrestlers and their support staff taking on the roles/persona of melodramatic/cartoonish characters... with traditional "Good vs Evil" aspects. In wrestling jargon, the Good Guys are "Faces", and the Bad Guys are "Heels"... but every once in a while, one of the wrestlers will switch sides. Thus, when a Good Guy goes Bad it's called a "Face-Heel Turn", or a "Heel Turn" for short... whereas when a Bad Guy redeems himself and goes straight it's called a "Heel-Face Turn", or a "Face Turn" for short.

So: The prompt usually means "Good person goes Bad", but I could argue that it wouldn't be much of a stretch to interpret it the other way, as "Bad person goes Good". Entirely up to you...