He walks through the gardens to the glasshouse, pausing at the entrance of the Tropical Lily House to glance back at the Captain. "Can you see it at all? I don't know if that matters to me showing you the lilies, but I don't even know if there's a door here for you to walk through or if it's open air."

To Sebastian, this was relevant because he was required to hold the door open for her. While he could remember this bit of chivalry, he had more or less forgotten that women weren't even supposed to be at the university normally. If he had remembered, he would have promptly forgotten it so he could enjoy this walk.