either before or after the conversion, and we know she was a very cold, emotionless person. Perhaps the 13x13 process twisted that into extreme callousness... who knows? It must be taken into consideration that she's trying to act normally for the benefit of Pevara and the others (except the couldn't-be-more-obviously-Black-if-she-tried Javindhra, of course).

The same is true of Mezar Kurin, who we've seen only very briefly and never had a POV from; moreover, the only hints regarding his changed behavior are the brief snippets Androl hears.

And since there's no good reason to believe the pointy-teeth people at the end are even Aiel, much less Aiel channelers, I don't think there's any point in using them as supporting evidence here. So with two cases at the Black Tower, I think Chekhov's gun principle applies, and is the more likely explanation than an entirely new form of bodysnatching having been introduced in the penultimate book.