Cue the Doobie Brothers "What a fool believes / he sees ...". Possibly Hector believes he and Hautwyrm are loyal friends or even lovers, and she views it as BBEG / disposable minion. He was the perfect useful idiot right up until he wasn't.

I think Hector was leaving roses for Vipsania earlier, now for Lumi? Fickle is the heart of a ghostly rogue.