[Noah Kleinberg]

Based on the way I read the rules, you only count as "impeding" a robot if you're keeping them from going counterclockwise, but not if you prevent them from going clockwise. ("IMPEDING: Preventing or obstructing an opposing ROBOT’S ability to proceed around the TRACK
in the direction of traffic."). G40 also says that a robot isn't considered impeding as long as there's a clear passing lane around the robot (this is also in G41 as far as pinning). The question is whether you would consider open space a "passing lane" if the hurdling robot's arm prevents it from using the space.

Edit: Someone beat me to it but I'll leave this here anyway.