How do you guys play Take Watch? By the rule, the player only rolls if “something approaches the camp”, but there’s no advice about how it should be determined if something does. I guess, by the rules, after the characters decide their watch order and bed down, they players probably look at the DM to hear what happens next, so it’s time for a DM move. DM decides whether to attack the characters, decides what time of night it happens, then that player rolls Take Watch.
It feels kind of arbitrary, though. Does anyone use Wandering Monster tables for this? Or any other, more clever kinds of randomization?