Went on a long ride along a bunch of hills and coasted downhill instead of keeping the throttle open to keep gas and oil flowing in, got on some flat land and it came to a halt, my girlfriend thought I had slammed my brakes it stopped so hard (she was riding next to me). It did start up again and limped home, barely.
Took everything off this afternoon to take a look. Can feel some light scratches on the bottom of the cylinder and there's some burrs bunched up towards the back, the rings are also scratched up (the scratches are on the bottom, I turned the rings in that pic to get better light for the photo). So I'm guessing at this point this cylinder is trashed, just looking for confirmation.
I know it's my own dumbass fault and will definitely be more careful in the future.