It was when he was fighting Lan. "Demandred blocked Lan’s attack, but he breathed hoarsely. “Who are you?” Demandred whispered again. “No one of this Age has such skill. Asmodean? No, no. He couldn’t have fought me like this. Lews Therin? Itis you behind that face, isn’t it?” So I read this and I paused. First of all, I don't remember ever reading that Asmodean was some incredible blademaster? When we was Rand's captive he was teaching Rand more about things to do with the power but never anything with the sword. Rand become so good with the sword because of Lan and I guess Tam. So I am curious, because we got tidbits about each Forsaken and their skills / personality when they turned to the shadow all throughout the books, why this was never mentioned? Furthermore, why would Demandred suspect that Lan was somehow Asmodean? I am fairly certain that all of the Forsaken know who has been killed and so on and so forth. They each had their plans and schemes but always seemed to have eyes and ears about what was happening in the world and certainly what Rand was up to. Secondly, even if Demandred had no idea that he was dead, and not to be returning because of his betrayal, why would he be fighting Demandred in the last battle.