Walter blinked. Guilt was not a reaction he'd expect from Pippi, but she was human and had feelings, so he supposed he shouldn't be.

"Don't feel guilty. You earned playing in the snow if that's what you want to do."

Walter wanted to stay someplace warm for a while.

"I'm alright. Victor's sleeping, so I thought I'd come down and have Dr. House have a look at my wrist. It wasn't worth bothering the doctor for last night"