We're a low level party (I think levels go from 1-3). We're fighting two gray renders (CR 8 each). To be fair, we had the option to instead fight the 10 hobgoblins (who, I'm sure, are not base hobgoblins either).
We're travelling along a forest and see these two groups fighting. In their midst is a small, scared child. What are we supposed to do? We have to help. A lot of us are good.
The hobgoblins were fighting the gray renders. Why, we have no clue; we just happened upon the two groups fighting with the child in the middle. We're just interested in saving the child.
We have someone with Ride by Attack or whatever that's running to get the child... and no AoO. In the meanwhile (since we can't know how that's going to go but it can't be well), we're going to try to distract the gray renders.