What if Sgaeyl showed Tairn what she saw on Conscription day? Sgaeyl looks directly at Violet, presumably because of the history with Xaden, but then Sgaeyl tilts her head and Violet doesn’t back down. Sgaeyl blinks and looks away. Violet says it might be a sign of boredom or approval - but what if in that moment Sgaeyl shared what she saw in Violet with Tairn. And then again on Threshing.
I think Sgaeyl saw something in Violet that deemed her worthy of a bond to her mate. Sgaeyl chose Xaden of because of he’s unrelenting, but in that moment, Violet was unrelenting too.
Tairn didn’t know about Xaden’s second signet hence the whole “Mom and Dad are fighting and everyone knows it” line in IF
Xadens signet
fourthwing