Lisbon undoubtedly knew the answer to the question Jane implied back then. And Jane must have hoped it was something in him that flipped her switch, even if he knew she’d most probably never tell him. It was such a personal comment, revealing Jane’s thoughts more than he was used to showing. And they both were oppressed by the understanding of how impossible whatever they imagined about being together was. And it’s so good to see how their getting together is making up for every moment like this, when they were left with nothing but guessing about what the other felt, how they open up more and more and how they get to know each other’s switches.