The oath against using the OP as a weapon should have prevented Elaida or any captive Aes Sedai from showing the Seanchan Travelling.

Elaida KNEW what they would do with Travelling, that they would use it to KILL and there is NO WAY they could have possibly made her believe they were going to use it for benign purposes. You can give a hundred excuses for it, but an Aes Sedai who is still bound by the Three Oaths can NOT channel ANY weave that she thinks could be used to kill someone UNLESS in the last defense of her life. Elaida's life was not in danger. Maybe torture as a damane, yes, but they werent about to kill her so she should not have been able to circumvent the Oath.

Teaching dangerous weaves to other Aes Sedai is NOT the same, as the teacher can truthfully believe that the Novice or Accepted she is teaching will not use it to kill unless she also is threatened in her life. The same rule doesnt apply to the Seanchan. Non BA Aes Sedai should not be able to teach the Seanchan dangerous weaves.

We know for a FACT that Aes Sedai captured already have proven that they COULD NOT form weaves to kill. ie they could not hurl fireballs or earth tremors or whatever, and the Seanchan even commented that they were useless for battle. The same principle should hold for Elaida, her most of all. of the captured Aes Sedai.

I feel like this was written so we could see Elaida again, and to get the Seanchan to use Travelling of course, but there should have been some other way it was done. Maybe in front of Elaida refusing to teach it, an Accepted who saw it done is forced to show it. It just shouldnt have been an Aes Sedai to do it.