Tress told Magnus that Magtress should tell Bubba about his feelings. Alex has said, basically, the same thing. But, like, it's fine? Magnus certainly doesn't want to make Galahad feel bad about doing the things he's gotta do, or sad about the things Magnus has had to do.

So instead he buries his face against Galahad's shoulder and holds on, automatically matching Galahad's strength precisely.