Crawley liked the angel. He answered his questions!
He stayed long enough to see the angel start to block the hole in the wall.
(So what if he wasn't supposed to be in the garden, or up top, after he "caused trouble.")
He was even going to help, not very demon like, but he couldn't even pick up any of the stones!
(He tried when the angel wasn't near, no point in saying he would help if he couldn't actually do it.)
He slithered away with an aching body - corporeal form was strange - and he wondered how the angel could move the stone like they were mere pebbles.