Started out with Jake, Fritz and Allie. After about 6 miles my achilles started to indicate that it might not be able to go another 10+ miles. It gradually became apparent that I wasn't going to be able to keep going uphill. Allie and I turned around and ran back (thankfully mostly flat or downhill) to the car. I don't think it was much a setback, because I stopped when I did, but I do now that I'm going to have to take some more time.