[She didn't notice someone watching her at first, as she was pretty deep in concentration. She'd gotten herself up about 15 feet off the ground at this point, hovering as she worked on taking her next step up. She'd been working her way up as if there were invisible steps in the air, and she carefully balanced and moved her leg up to take that step--]
Wha-?
[She looked at him, distracted from her movement by Castiel's sudden appearance in her face. And that semi-solid feeling she had going to keep her up suddenly disappeared.]