"Besides, not everyone is as perverse as you," Albus adds darkly. "Anyway, I've equipped Severus with Apparition runes. If you feel like leaving, take his hand and press it against his collarbone - under the robes. Both of you must hold on to him, or one of you will be left behind. If you don't get home immediately, you'll have to keep trying until you do. I'll leave him activated." He closes the book. "Any questions?"