Video evidence!
Also... if you would like to see Rob finish the marathon, go here and put in his name in the middle box, and then click on the link that comes up. (It's Windows Media, unfortunately.) He doesn't show up for a few seconds after the clip starts - he's the guy with red shorts on and no shirt. You can clearly see the hitch in his gait every other step. That's the hamstring thing. (But hey! 2:59 and change is still nothing to sneeze at!)