Rodolphus just managed a little laugh, expecting such a response. "Your father has already proven his folly, and now that the truth is out, his failure is complete."
He heard the vehemence in the words, half expecting them. However, he misjudged Vaisey's strength, surprised by the ferocity of the slashing hex he just managed to dodge.
Not fast enough, he felt a stinging slice down his arm as he cried out in pain. The time for mirth was over. He lost focus on his wife for the shortest of moments, aiming yet another Cruciatus at Vaisey.
As he aimed, he looked on at Vaisey in distinct pity. "What a pity. I was going to let Bella play with you. I don't think I'm going to leave enough of you for her to even toy with."