Theodore plodded into the Slytherin common room with his hands stuffed in his robe pockets to keep them warm. He wasn't especially interested in his surroundings right now but did notice Professor Culloden in the common room, so he naturally straightened up his posture.

He sank into a chair and rested his hands on his knees. His eyes went all spaced out for a moment. You know, where you're staring at something or someone without even realizing and without even blinking. Basically, he was watching the potions master but not actually watching the potions master.