Egeanin captures Bethamin and holds the sul'dam in her basement. Egeanin accidentally discovers that the a'dam works on Bethamin, much to Bethamin's horror. (TSR,Ch38)
Caught up in her conflicting values, Egeanin frees Bethamin. (TSR,Ch51)
After days of being cooped up together, the Aes Sedai and sul'dam are nearly at each other's throats. The three Aes Sedai sense a huge amount of saidar to the north. (CoT,Ch3)