[EricH]

Originally Posted by Jonathan Norris

Its not a legal move, if you read the rules the trackball must either contact the ground or an opposing alliance's robot to be counted as a hurdle. I think they just tried that b/c its a practice round and they weren't counting the score.

The manual begs to differ:

Originally Posted by Section 7.2

HURDLE: When a TRACKBALL CROSSES a FINISH LINE while passing above the OVERPASS and then contacts either the floor or another ROBOT before re-contacting the originating ROBOT.

(emphasis mine)