Crowley's powers aren't strong here, but they're doing something. He can see the muzzle, he can feel the leash in his hands. When it flickers into existence, he's going to pull at it, try to get a hold on the creature, try to get it closer.

Maybe not the brightest idea, but he has the human soldier person here, and the human soldier person is strong and fierce and---

Oh holy shit the human soldier person is all but diving on the hound barreling at him, the one Crowley was completely oblivious to because he was focusing on the green eyed spirit.

"Yeah, that's right, you can do it!" Crowley says, half-heartedly. He's never been much of a cheerleader, but he's trying.