In The Great Hunt, Liandrin takes Egwene and Nynaeve through the ways into captivity, and leaves her friends (apparently) to be killed. Why go through all the trouble if the someone wanted them out of the way? Why not just kill them?
The quotes within that section make it clear that someone, presumably a Forsaken, has ordered Liandrin to deliver Egwene and Nynaeve to Suroth, alive and leashed rather than dead.
Liandrin laid a hand on Nynaeve's shoulder and one on Egwene's. "These are the two of whom you were told..."
This quote indicates that those two had specifically been mentioned to Suroth. Since she appears prepared to take two marath'damane and leash them, it's clear they were meant to be delivered alive.
"You were to bring me two," Suroth said.
Just a confirmation that Suroth is working off the same script here, and annoyed by the extraneous presence of Elayne and Min.
"I brought you three," Liandrin said calmly. "If you cannot manage to hold them, perhaps our master should find another among you to serve him."
Here Liandrin indicates that she and Suroth share a master, and are therefore both taking orders to perform this transaction.
"If either [Egwene or Nynaeve] is allowed to remain here," Liandrin said tightly, "our master will trouble himself with you, Suroth. Take them both, or pay the price."
Again, the master is mentioned, and it's clear that he wanted Egwene and Nynaeve leashed and taken by the Seanchan, not killed.
Quotes are from The Great Hunt, chapter 40 "Damane"