"The guards aren't near enough to hear anything like that." Hannibal taunted. "Before I came in here, I requested that they station themselves far enough away that they wouldn't be able to overhear even in the event that shouting occurred. Doctor patient privilege, you see."
He knew that he was just goading her on, which was the purpose of everything he'd just said to her. From the beginning of his account of her to the admission he could hear her heart beating, it had all been done to rile her up. See what he could make of her.
For his own part, he showed no signs of moving. Nor did he show any signs that he was worried what she might do to him.