Walter would really like to be less aware of how near the ghost has moved to him. "Oh. Um," He wants to fidget more, but that's something else he's suddenly feeling very awkward about.

"Do you have a-" He attempts what he figures is a reasonable question even for not dead people. He doesn't quite manage to spit it all out before abruptly cutting himself off when she puts her hand on his arm. It startles him enough that he half-stumbles. It's not even how chilled her hand is, or that she's a ghost. Someone is willingly touching him and that's more than enough to throw him off balance in basically every way.