“Very well,” Egwene said.

“But,” Seaine said, getting out a sheet of paper, “that taken into account, I have three theories on how one might defeat swearing on the rod. First, it is possible that the woman has another Oath Rod. Others were once said to exist, and it’s plausible that one rod could release you from the oaths of another. Mesaana could have been holding one secretly. She could have taken the Three Oaths while holding our rod, then somehow used the other to negate those oaths before swearing that she was not a Darkfriend.”

“Tenuous,” Egwene said. “How would she have released herself without us knowing? It requires channeling Spirit.”

“I considered that,” Seaine said.

“Not surprising,” Yukiri said.

Seaine eyed her, then continued. “This is the reason Mesaana would have needed a second Oath Rod. She could have channeled Spirit into it, then inverted the weave, leaving her linked to it.”

“It seems improbable,” Egwene said.

“Improbable?” Saerin replied. “It seems ridiculous. I thought you said some of these were plausible, Yukiri.”

“This one is the least likely of the three,” Seaine said. “The second method would be easier. Mesaana could have sent a look-alike wearing the Mirror of Mists. Some unfortunate sister—or novice, or even some untrained woman who could channel—under heavy Compulsion. This woman could have been forced to take the oaths in Mesaana’s place. Then, since this person wouldn’t be a Darkfriend, she could speak truthfully that she wasn’t.”

Egwene nodded thoughtfully. “That would have taken a lot of preparation.”

“From what I’ve been able to learn about her,” Saerin said, “Mesaana was good at preparation. She excelled at it.”

Saerin’s task had been to discover whatever she could about Mesaana’s true nature. They had all heard the stories—who didn’t know the names of each of the Forsaken, and their most terrible deeds, by heart? But Egwene put little faith in stories; she wanted something more hardfast, if she could get it.

“You said there was a third possibility?” Egwene asked.

“Yes,” Seaine said. “We know that some weaves play with sound. Variations on vocal weaves are used to enhance a voice to project to a crowd, and in the ward against eavesdropping—indeed, they’re used in the various tricks used to listen in on what is being said nearby. Complex uses of the Mirror of Mists can change a person’s voice. With some practice, Doesine and I were able to fabricate a variation on a weave that would alter the words we spoke. In effect, we said one thing, but the other person heard another thing entirely.”

“Dangerous ground to walk, Seaine,” Saerin said, her voice gruff. “That is the kind of weave that could be used for ill purposes.”

“I couldn’t use it to lie,” Seaine said. “I tried. The oaths hold—so long as the weave was there, I couldn’t speak words that I knew another would hear as lies, even if they were truth when they left my lips. Regardless, it was an easy weave to develop. Tied off and inverted, it hung in front of me and altered my words in a way I’d indicated.