You should've left him alone, he said that he needed to be alone to "take care of something" and that should've been that. But instead, you sneakily followed him to the lower basement levels of the chapel well after dark and into a spacious ritualistic room that contrasted the chapel above ground.

And that's when you witnessed it, the assumed "angel in disguise", Father Box Tenshi's back sprouted out multiple black and blue luminescent tentacles. Live and wriggling like every single one had a mind of it's own from the priest's back. You go to retreat out of the chamber only to feel something pulling on your ankle, looking down you see one of Box's tentacles wrapped around your ankle.

"Going leaving so soon, little lamb?"