You've mentioned something similar I think, but I had no idea you could use it in such a way.

[ to sense people's health, their.. aether, their spirit. she looks impressed, or as impressed as she can at the moment. once he's in, she shuts the door and ambles toward the sofa, muffling a cough in the crook of her elbow. ]

That's rather a convenient ability. Glad to know I am still me.