*is head-down in full Geek Mode, with one pencil behind his ear and another between his teeth and a third in hand, with the rarely-seen reading glasses perched on his nose what he's dealing with strings of tiny numbers these days shut up, when he hears your knock (?)*
*carries his textbook to the door with him, still buried in the equation he's been re-working (ow, that was the doorframe)* *manages to get the door open one-handed* H'row? *glances up and blinks, hastily dropping the pencil from his teeth into the book crease* Oh. Hi. The hell?Stop laughing.