At least there was a door for him to slam, and the loud SMACK as he slammed the clinic door closed by pushing it with his cane when he stalked out could probably be heard throughout the entire compound.
He couldn't even say why he was so angry, just that the image of Stacy curled up on that jackass's lap made him want to spit nails. And Malcolm's cane on the floor beside them, taunting him, like... hey, it's another version of you, but a better one, one that isn't such a misanthropic bastard. And he could remember her curled up on his lap like that, back before the infarction, back when he could carry her to the bed, when they used to make love all day on Saturdays, play raquetball on Sunday mornings. And then when he tried to remind himself that it didn't matter, because he loved James now, he just got an image in his mind of the two of them together, and he wanted to scream.
They were probably in there right now having sex, Stacy and whats-his-name. And he knew he had no right to even care, let alone be pissed off, but his entire body was tense as he stalked/limped into the rec room and sank down onto the piano bench.
He let his fist fall onto the keys. Not hard enough to harm the piano, but enough so that it made a loud, dissonant sound that matched his current mood.
[OOC: This takes place immediately after
this scene in which House walks in on Malcolm and Stacy. So I guess you could say it's backdated, but it doesn't really matter. You know I can't resist a good reason to have one of my pups in a pissy mood.]