Dude should have told Kurune that for the cooking lessons to continue, she must listen to Flora 100% and never do anything Flora hasn't specifically verified to be okay, nor try to do anything before Flora has given her the okay to do it. If Kurune can't follow these two rules, then he can't risk his wife's life. After all, with someone casting a fireball inside their own house, you can't accept half measures.
Alas, the author was in too much hurry to get to the ero scene, so no panels could be wasted on things that would make sense.