[It is easy to gravitate towards the one person who seems just as uncomfortable about this whole thing as Sansa feels -- magic is still an anomaly to her, and seeing people practice it openly, creating things and making brooms come to life, it's just...
It needs some getting used to.
So Cass may notice she's not the only one standing in the sidelines; Sansa keeps watching the goings-on, flinching slightly when someone makes a green flame that burns out as quickly as it came to life.]