D
My guess is that boot has a slider on it. He is running right on the edge of traction. Similar to a knee on a SS, that foot both provides him with feedback on lean angle and a nudge back up if the bike starts to slide away.Al Bundy sure showed those crotch rocket guys who's boss.
What's with the foot thing... I get it on dirt track I guess, but on anything solid if seems like a recipe for a busted leg in a split second if you do actually lose it.
with legal betting going on; I believe..Japanese version of Speedway.