[He waits for her to catch up, though with the pent up frustration he feels, he hopes it's something he can vent on and kill. However, he had left Flamek and his holster back by the counter, believing whatever it is, they could handle it on their own, with dreamotion if needed.

Taking a step onto the stairs once Tifa reaches him, he frowns as his ears remain pricked forward, carefully listening the steps. From the weight to the pacing, he can gather a little bit more of their "guest."]

It's an animal, four legs, small but agile. I'm still betting it's a cat with the way it's moving. Reminds me of Clover.