Bet none of you can beat this: I got dropped by a guy with one leg on Sunday!!!

Guy pedals up next to me tucked down in an aero position on his aero bars and he's spinning away at probably 130rpm when I notice he only has one leg!!! The other below the knee is a carbon fiber/aluminum leg clipped in to his pedal on the right side of his bike. I followed him for a bit (not close enough to draft) but not losing any ground either but after a few minutes I just couldn't keep up the pace and so I let him go. He was not real smooth with the pedaling either which I assume is because of his lack of a calf muscle? I was trying to figure out the mechanics of it while trying to keep up with him.