I'd have at least stayed the night, good excuse for a quiet evening out. Then again, they may have had things to do and didn't want to unnecessarily worry folks when they didn't return on time. They made this Stay or Go decision in the field at the time and it appears they made the right choice. . . for them.

The people who are second-guessing their decision weren't there and it may not have been the correct choice for those individuals.
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Better is the Enemy of Good Enough.
Okay, what’s your point??