The bone-pile was huge, but with Xavin cycling through a bunch of really cool and useful powers, they were starting to get the better of it. It couldn't get close enough to hit him and Dean, and as long as Mom stopped standing in front of it and trying to tank when Xavin could obviously take the punishment, they'd wear it down, soon.

Since the exorcism wasn't doing a damn bit of good besides giving Sam a splitting headache, Sam stopped and dashed off toward the side to get a different angle on the exposed joints. Without the exorcism ongoing, he could redouble his efforts and add a second and a third blast of focus fire to the same spot.