Neither of the others answered; all three of them knew that Snape and Harry's mutual enmity had been absolute from the moment Harry had set foot in Hogwarts.
If one were optimistically inclined, one might see tragedy as providing an object lesson in resolving conflicts reasonably in a world of overwhelming enmity.
The Marquis thanked him in terms by no means deficient in gratitude. Lorenzo then informed him that He had nothing more to apprehend from Donna Rodolpha's enmity.