Perhaps sensing someone else had odd man out syndrome (although Charlie had embraced his odd man out-ness. It's just the way he was, he liked books better than people ...) Charlie called; "Hey! Wait ... I gotta get down there to my books."
Charlie leaned out the open window, and glanced down. There really wasn't a drop at all, this being the first floor, but getting himself through the window was going to be a tad challenging. There was a lot of Charlie. There wasn't a lot of open window.
"Don't go anywhere with my books!"
Charlie could see some of his books off to the side, and than Noah carrying some books, and well conclusions got jumped too.