Against the Cult: Disappearances (1.6)

A few notes:

1) Left alone, the bear will remain asleep until some time after the party leaves in the morning.

2) You could assess the bear while it is unconscious, to get a sense of why it risked coming into the camp. That's be an INT (Nature) check.

3) You could attempt to bind or contain the bear in order to revive and speak with it. That obviously presents a number of logistic challenges, as the bear would be hard to restrain and likely disinclined to talk - it's not clear whether it would have even been ready to talk before the combat.

4) Slaughtering and butchering a big animal like the bear takes a lot of time...and then smoking or otherwise preserving the meat so that it wouldn't spoil and work as rations would take days.

5) On a meta-level, the PCs all got the XP benefit of completing the bear encounter already; there's no additional mechanical benefit of sticking around to kill it. If left to survive, this bear will forever be wary of humanoids and you will not encounter it again (an explicit result of the wandering monster table for the Dim Forest is that, once encountered, you do not have the same encounter ever again).