Charity? That was most certainly not the request Bruno had thought Heidi was going to make of him. He was more or less aware of the inner demons his wife struggled with on any daily given basis. The human experience was one of great suffering, and enduring that suffering was something we all must do.
Over the years, Bruno had done everything he could to help his wife overcome the challenges she faced during her childhood and early adult years. And to a great extent she had improved leaps and bounds. Only really manifesting her psychotic and possessive tendencies when a threat appeared before her or her family.
It was because of this he expected the woman to request that he kill the Prince Regent of Bavaria. Bruno was the type of man willing to give his life if need be for the sake of his wife and children. Hell, he would gladly take the lives of a million men if they dared pose a threat to his loved ones.