Okay, if you're here, that ain't work. OKAY! That's fine! Try the next step: Forceful realignment.

Get your utility knife, spudger, flathead screwdriver, whatever's flat and strong and get it under the head, and manipulate it around a variety of directions while unscrewing. This can cause it to get removed and I assume it's because of a loose and weakened thread.

If that doesn't work, or if it's too low to get under, proceed to next step.