The return trip turned out to be uneventful.
As it turned out, the Dark Church was so mauled by the Barbaric Baboons that they didn't have any forces to spare for investigation or searching for their high-security prisoner, even though we were literally next to them the entire night. No other Dark Church members left the base, but I was pretty sure it wasn't as if they were entirely wiped out. Surely the surviving security personnel left within the base was more than enough to finish off the few Barbaric Baboons that infested their place.