They explained this on Outrageous Acts of science. He's actually walking backwards like a normal person would, but he's altering his movements so he looks like he's sprinting back. His feet still touch the ground in a safe way that allows him to get going really fast. Also, slippery roads.
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DefinitelyNotADog
Sep 01, 2014 at 02:55AM EDT
Snickerway
Sep 01, 2014 at 01:15AM EDT