Hannibal took the time to look around himself and gauge the room they were standing in. He couldn't know the bigger uses of it, obviously, but he could smell the lime and water, and the fire created a creeping heat that could be felt even from where they were standing, should somebody be attentive to it.
"Interesting." He said, both of the promise Erik had made and the room that he'd been brought to. Imagine having so much built for death and the concealment of corpses at your disposal and not being able to use it, all for a few words from a dedicated mouth.
Only one in his life had ever asked him to stop killing, and though he had loved her, Hannibal had not been willing to give her the word that he would cease his actions. At that time, he'd still had more work to do to avenge his sister. But even if she'd asked after that, he didn't think he would have agreed.