He penned one to the Weasley girl first, as he thought that would be the easiest. He would have the opportunity to talk to her in the morning and explain things better in person. And hopefully, Granger would be awake by then to help him explain things. The letter to Potter and, by extension, Weasley was a different matter. He tried several formulations, but they all sounded horrible and frightfully terminal whenever he put them into words. In the end, he settled for the basic facts.