He just left. Tears sprang to Hil's eyes. Honey, don't do this to yourself. I'm not doing anything to myself. Rocks fall out of the sky all the time.
People trip on banana peels and hit their heads.
That's what had to have happened. He wouldn't have just left without saying anything. Hildegard ran to her room. She found her cat, Mylo. She tried to talk to him in alien talk, but he just stared at her, and rubbed his head against her ankles.