[He doesn't like the idea of a Trace any more than Ron does. It reminds him too much of the time when his Dad tracked his movements at Hogwarts with the Marauders Map. Merlin, that had been hell, for more reasons than the constant vigilance.]

They summoned me by name. Based on what I've heard and what Scorpius has said, they're not the sort of people who ask twice. Unless the idea is to go into hiding for the rest of my life, I don't have any other choice.

[He gives Ron a comforting smile (or at least, what he thinks is a comforting smile) before he turns serious once more.]

You don't have to come with us. In fact, it's probably better if you don't. That way you might be able to avoid the registry as long as you can.