Perhaps he'll be a touch more interested in how their wings are...pushing through the wall, one to the side, one above the doorframe. Not breaking it, simply resting in it. It looks like they forgot they could even do that. And those hooked claws, the upper outline of the wings--those look almost exactly like bone.

Moon quickly gets in front of the nearest one, putting her hand on the golden bit and examining the shimmering purple around it. Just because Nebbie can be incorporeal doesn't mean there's no injury possible, and there might be splinters.

Nebbie sings at him, slipping thoughts into his head: two human hands waving in the shape of a rainbow, like Moon's done before, and an impression of flying above the sea in deep moonlight--excited cheer! Hello, hello, this is neat!