Yeah. The problem set in near the end of Day 1 when I stopped for dinner—when I got back on the bike, I realized my Achilles' tendons felt really tight. I stayed in the race another three days, but despite a couple of attempted remedies, they just got worse. The first day was cold, rainy, and windy (my bike looked like I'd been in a cyclocross race by the end of Day 1); I was late getting to the starting line and didn't have my leg warmers or booties on for the first 70 miles, and I think that's what did it.
On Day 4, I called my wife and said "This isn't fun. This isn't even Type-2 fun." My first priority was to avoid serious injury. Taking those two things together, scratching was a no-brainer. Luckily, Baker City has a pretty great bike hostel where I could cool my heels (literally and figuratively) with a couple other racers who were having problems.