Iron is going to suck, a lot, which means once Childermass closes the distance between the two of them, he needs to try and end this fast. Iron will, unfortunately, be a surprise, although in retrospect it shouldn't really have been. Coming in he leaves his wings spread, casting a shadow and trying to dig talons and the teeth of his serrated beak into Bezaliel just as much as the bear himself is trying to get iron-clad claws into him.

It'll be a struggle of shadows in the end, Childermass equally calling on the shadows to try and sink Bezaliel down into his own version of a shadowy prison.