If I were scum, I wouldn't try anything hinky with the duel voting. We maybe caught them unawares this time by not bringing up vote claiming until after the vote, but I doubt it. It's going to be more of a deterrent than anything, and I don't think speculation about yes or no voters will get us anywhere. I feel like we have been going in circles on this with nothing to show for it.
e's specific vote of "yes" when he was one of the combatants is really interesting. It seems like a crazy risk for scum to take, but low utility for town. It is also possible that he voted no and is claiming yes, but why do that? Could be for towncred, except it's not a very towny move. If he's town, generating discussion was pro-town but getting lynched isn't. Sometimes I'll go with something just to make things interesting - like if someone sends me a cookie in the night, I'll probably eat it (chocolate please). Being one of the combatants could seem fun to him. I'd like to hear more from him about how he made this decision.