I have no idea what triggered this. I hadn't changed the skins prior to the video, but I had been messing with it for a few seconds before I decided to record. I tried running then ducking to slide under the wall in 1-2, as I am wont to do, and I guess something I did stuck me in a sliding mode. Hitting a direction made me slide in that direction indefinitely, holding the direction made me slide faster. Jump didn't work.