Yang gives the guy ("Deadpool"? Seriously?) a hard stare for a moment before she takes the handshake. "Glad you understand that. Don't do it again."

Then she reaches up and touches the ears. She winces a bit when she feels it twitch in response. "I...don't know." She admits wide-eyed, looking around to see if there's a window or other reflective surface to catch her reflection in. This is clearly throwing her for a loop...falling through the world is one thing, but she wasn't expecting to become a Faunus on top of that.