Leonard doesn't acknowledge the question for a moment. He's busy moving his hands to pluck the growing buds off. He's done something wrong, said something wrong, despite the fact that he'd thought himself to be telling the truth.

Leonard has been of a duplicitous mind for a long time. Double-minded, knowing he was doing wrong things despite his own justifications for why those things are right. He has a very clear flash of understanding—and then he clenches his eyes shut, denying it to himself.

"No," he says, not answering Washington's question. But then he parses the fact that Washington had spoken and amends: "I used it. It's not full. I shouldn't be here. Is this a dream? What is this?"