She ate him. That little revelation caught his attention, had he been indecisive about studying her before he was no longer. She too was a cannibal essentially. Still he did not betray his new conviction to study her in depth nor any surprise at finding out that she ate her Master.
"Perhaps you would like to expand on what you call 'an episode', Miss Darlington" Dr. Lecter asserted, it was not a question yet not quite an order. It was interesting how she had returned to her previous business-like mindset so swiftly. He had also not answered her question, quite deliberately so. It was not as if he would feel guilty in refusing the medication, instead he would observe the effects of doing so with interest. Although he did not want to do that at the present moment, first he wanted to ensnare her.