So much math, and absolutely none of it noticed by Wei Wuxian, who is taking all of this pretty much at face value, because after all, Nie Huaisang is just some guy (non derogatory). He too glances back to the window and its inhabitant, but with none of the fear and general squirreliness, just utter casualness and maybe a hint of pride.

"Are you sure that's the problem? Why's there so much water, anyway? Did you like the bay so much you brought it home? And what's with this greeting? 'Clan Leader Nie' is too good for old friends?" So that's how it is, querulous and frankly needlessly judgmental interrogation, and general impropriety to boot. Condolences are probably in order, but that's awkward and Wei Wuxian is still fielding the relief of not encountering Nie Mingjue, they'd come off insincere. "Not that I expected tea, so soon after getting here, but visiting you is such hard work."