The center did have his hand on the ground, I didn't see that the first time I watched it, so I guess hurdling is not the call. However from the replay it is hard to tell if the player actually stepped on the centers back which would be a foul. I guess the umpire would have had the best view of it so he must have cleared the player. I'm not sure about the hand on his team mates shoulder to leverage himself up and over though.
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