We know (or, at least, I think):
1. We intercepted 3 cultists from coming here, and took their place.
2. We can reasonably expect the rest of the Hootenanny is probably expecting those 3. Time pressure.
3. We were told that anyone here likely knows we're here now, cuz of the noise we made. Increased time pressure. And an awareness pressure/an expectation from anyone here to perform as the 3 missing cultists would.
4. Presumably that expectation is to return to the Hootenanny. Now we know maybe/probably with the boy.
So, hanging around out here, questioning Anzila, could seem odd to those waiting. Cuz:
1. It's taking too long.
2. Why would 3 cultists who know what's going on need to sit and talk with the prisoner?
3. It's extremely risky, because our ignorance would almost surely tip off Anzila that were intruders.
4. Who knows what else is going on? They could have Jacey on an altar ready to sacrifice. They could be performing a ritual to summon some unfriendly force as a part of the Hootenanny.
It doesn't seem, to Bruv, like there's any room for investigation at the moment...