That is great feedback on TDA. I designed the move to have to choose between a gesture to redeem them and inflicting the harm (ie lopping off an arm) even though I know duels that we have seen could culminate in both. I can also see where it is strange that it seems like all three should be possible hah. I have already made some changes to this move in the new version, but I will put some thought into this before I publish to make sure everything is as tight as it can be. Perhaps it should be 1) inflict the harm or 2) redeem them and clear dark side. Especially if you have decided a particularly bad baddie needs to be "redeemed" more than once.
I'll also say that if a player chose the redemption or the dark side option, but expressed an interest in inflicting some sort of memorable wound, you could absolutely as the Senate say that they chopped the opponent's arm off in the process. My general advice for PbtA in general is to have the player choose the mechanic and then work out what that looks like in the Fiction collaboratively. It might be tough to logically wrap your head around "they lose an arm yet take no harm," but I think it's reasonable.
I am so so glad to hear that your group enjoyed the one shot, despite the awkwardness surrounding that particular move! Thank you for playing it. Don't hesitate to reach out if you have any other questions!
Cheers,
Ian
P.S. it is in part, due to your earlier feedback that I have introduced some changes to dark side and provided an extra way to clear it with the influence system, which you'll see once I publish the new version (still waiting on some artwork and editing) so big thanks for that!