[ castiel watched; assuming that kitty was aware of whatever it is she was doing; playing a game, maybe? it wasn't until she thudded against the ground that he realized that wasn't the case, and then the guilt followed.
not a second after, he appeared beside her. it was probably a good idea to figure out if she was conscious or not-- or harmed. that was pretty high off the ground, but he wouldn't expect it to have been completely fatal.
his face, close to hers as he inspected, reflected his surprise when he saw that she was human -- evolved to do whatever it was she was doing up in the air, there. ]