Well, he remembers her and Scowl from Chika's nightmare, and while Scowl was all getting hit in the 'Mirror trauma' and 'don't touch me, Canis', Trixie was slightly better.

Plus, he's already convinced Lucky doesn't like him, so any Vulpecula who is not Lucky is preferable to dealing with her.

I don't think it would occur to Honor to target the tinies. Just... jeez, what kind of person messes with kids?