Last year was a perfect example. The forecast for the last leg was "ominous" as thunderheads were rolling through the course that day. Plus combined with the desolate GA coast, several teams decided that their personal safety was more important than completing that leg. Nobody thought less of them but the race still continued.
There was quite a debate as to whether or not to cancel the leg. Trey told me when he hit the beach -
"You know in video games, when you get to the end and you have to fight the boss?" <points towards the south> "That was the boss"