His front wheel seemed to go over a dark area (pothole or asphalt patch) and shudder, then his right hand comes off the bar.
https://streamable.com/0e7v6r
Definitely looks to me like a pothole or some other imperfection on the road, the way his front wheel buckles would suggest that.
Agreed
Kirby described it as a pothole 'no bigger than a block of butter'.
@ElGonzo started
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His front wheel seemed to go over a dark area (pothole or asphalt patch) and shudder, then his right hand comes off the bar.
https://streamable.com/0e7v6r