"My husband..." Words that all fathers fear. They know that one day they will listen to that and suffer by antecedence until that moment. Well, at least those who love their daughters.
No father can say they're happy when a strange man appears out of nowhere and steal their little princesses. They spend so many years giving their best for their daughters, and one day they realize they are no longer the most important man in their life.
With that thought in mind, no one could blame Heike for not reacting well to discovering that Rose is no longer his little princess. Not even Lucien could be upset with a father for such a reaction.
But Heike already expected that day. It took him several years to realize that Rose was growing and would inevitably become a woman. That's why he prepared for that moment.