There's a very clear second where Walter's face makes it evident that he knows he's been had. It's not quite panic.

But then, he more-or-less asked for this, didn't he? So he sighs overdramatically, plopping himself into the chair with drink-and-coaster, and crooks one eyebrow.

"Kind of unfair if we're still doing point-and-click, isn't it? ... For the game, I mean. I can do commentary, though; that's not a problem."

Fortunately, he's telling the truth, there, and not just putting on bravado.