Cedric made a very simple, understandable mistake: he took the Roadblock clue and ran off, and just plain forgot that he still had his backpack on! Once he realized, I'm sure he thought, "Oh that's okay, I can manage" ... until he found out how long this roadblock was actually going to be, which no one knew at the beginning. Well it's a rookie mistake ... you can be sure he'll never make that one again.
Even so, I was amazed that he managed to come out first out of the 2nd zipline ... then crushed that he still managed to finish the RB last. Man that RB! The RB was like a mini-leg in itse