[Arthas switches tack and Crowley winces, not at the layer of ice building around his shield but Letty's now-bleeding hand. He can reshape the shield around the sword, outpacing the ice, but he can't do anything about someone else's wound.] Except keep a promise, apparently.

Which I probably shouldn't get in the way of, but he made one to me too. [He turns to Arthas with his arms crossed.] Don't try to deny it.

I'm still lost here. How'd she get under your skin?