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He's buffing out the cracks and bumps in the track's surface.
Actually, that is EXACTLY how to ride it when you have to put it down...Law Enforcement Motor Cops are thus trained to crawl up on a downed bike...they intentionally practice this as part of their training.
Tetsuta Nagashima at the Red Bull Ring 2018. Google the complete video. Had to lay her down huh? Exactly what not to do.
I didn't know motorcycle surfing was a thing.