Walker stumbled through the hall, scuffing his foot against a pillar and cursing to himself. Maybe if he had been watching where he was going he could've avoided that, but at the moment his nose was buried in a notepad full of scribbles - vague psedo-latin phrases and a large jumble of complex mathematical formulas covered it.
He made a few marks over in the right hand corner, looking up briefly to make sure he was going in the right direction. Of course, he wasn't even sure if he was on the right floor - he hadn't been to the library in years. In fact, he had barely been outside his room these past few years at Hogwarts, and when he was out, he was walking the now familiar route to the great hall.
He glanced up again, rounding a corner, and plunged his face back into his notepad. A bit more power here...unicorn tail to route energy here...
He tripped.
Walker tripped all the time, so it was a common enough occurrence. However, usually he was tripping because of his own clumsiness. This time, the offender was a book, strewn carelessly in the center of the hallway. Walker blinked for a moment before pushing himself to one knee and grabbing his glasses, which had skittered to the ground during his fall. He glanced over at the book he had tripped on, a book on engineering. Odd. He hadn't realized Hogwarts carried those kinds of books.
This distracted Walker for a moment, until he remembered that he was still on the ground and that book was responsible. A quick check to the left showed him the reason the book was in the hallway - an odd looking girl sitting up against the wall, tying her shoe. He tried to place just what was so off about her, but failed until he realized that he sweater was on backwards.
Hm. Maybe Hogwarts had decided to take mentally ill kids this year. He wouldn't be surprised. It would almost be an improvement on their previous batch of new kids.
"Why was this book in the middle of the hallway?" He asked finally, picking up the book in question and speaking in very slow, precise tones - the way you might speak to a young child.