He did well, but would benefit from watching the pros do it. This Harley guy slides his butt everywhere, which is OK, but leaves his helmet centered between the handlebars. That keeps his center of gravity close to the bike's centerline, so a lot of that butt-sliding doesn't help as much as he may think.
Watch a professional rider's video (
) that shows how much their
upper body moves off line. 'Kiss the Mirror' or 'Chin on your Wrist' are two ways I've heard it explained. The pros also put a deep bend into their inside-of-the-curve elbow and keep their head upright, looking for the exit of each curve.
Here's a still photo of
Mama Yamma's main man that shows what I mean. Note that he cannot 'Kiss the Mirror' because he doesn't have any,
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Mentally, I understand this riding posture; intellectually, or in a classroom manner of understanding. I ride like a Grandma, never like a MotoGP guy, but have been known to keep my butt in place and 'Kiss the Mirror' in serious twisties or when the pavement's wet.
And yes indeed, I give the Harley guy big props for sliding out early but keeping on the throttle.