"I know you're there, there's no point in hiding from me. Show yourself," I remarked icily, sensing that I was being followed.
"My, what impressive senses you have. I'm basically air and you were still able to pick up on my presence, how impressive," Came a chuckle from behind me, as I turned around to see a, uh...cloud of mist with a human face in it, hovering around the ceiling.
"I see, you have the power to turn yourself into mist, is that right?" I surmised, as he then floated down and became solid, the mass of mist taking a human shape and materializing, with a thick cloud of mist around his crotch to cover up.