From the blog:
"At this point things were definitely becoming difficult and I was pushing myself very hard. I was grunting and hurting, hungry and thirsty but eventually I got a visual of him, literally, slipping all over the place almost falling to the ground. I couldn't believe it...I had him right where I wanted him. I reeled him in and passed him on his right and tried to push past as quickly as I could but didn't have a whole lot of "turbo" left.
I had used up so much energy reeling Ryan in that after a couple minutes, and hitting some flatter, less muddy, and more runnable sections Ryan was able to scurry past me and I was able to see what it's like to have 2:14-type-speed! Pretty incredible. I don't think I ever ran or raced so closely with someone of that caliber. (To be fair if he had proper shoes on he probably would have been finished by then)."
Dude says he used a shoe called the Bare Grip 200. Google it; he was basically wearing a pair of soccer cleats.