Theo and Hermione eventually started dating – courting his father called it. A fresh tattoo was on Theo’s forearm when he arrived at Durmstrang – she suspected Lord Voldemort had Marked him in petty retaliation for "stealing" Draco Malfoy away from him – but Hermione really didn’t mind. She could always erase it, or give Theo a Hagalaz tattoo on the other arm, if he wanted to officially follow her instead one day. Crocell said lesser demons changed their allegiances all the time – as often as every couple of centuries – to follow the strongest leader. For now, Theo’s Dark Mark kept his father safe.