[Hammer]

Marathoners don't stop for anything and sure as heck not long enough to find a bathroom or lake to wash off in. They grab drinks as they run and for the most part you don't have to pee while you're running because you sweat it all out anyway. However, occasionally a runner pushes themselves so far they lose control of their bowels. There's a famous incident that occurred at the Olympics many years ago with a female runner that had pooped her pants and kept going and got to the point where she was actually crawling the last several hundred meters just to finish.

P.S. The world record for a marathon is something just over 2 hours so they don't usually last long enough to worry about bathroom breaks and it's not likely he new it was coming