So, final confrontation with Leo. Zarc comes out of Yuya, and Leo goes all "Oh, it's the demon Zarc, the darkness inside Yuya, blah blah blah".
At which point, Zarc just crashes out, like "excuse me, bitch?!? How the hell am I the villain here? Sure, I may have gone a little crazy and tried to kill everybody, but I never used CHILD SOLDIERS to do it! Oh, and every since then, I have done nothing but be a vaguely helpful fight-or-flight response for my sons, you know, because I love them. Which is apparently more than you can say. You had, like, four chances to not be a failure of a parent, and you blew it. Look at him!" *Gestures to Reiji* "He was a perfectly good child, and you fucked him up! And that's not even mentioning Yuri, who I KNOW was a perfectly good child, because I MADE HIM! That twisted little personality of his? That's on you! Oh, and speaking of fucking things up, let's talk abiut the fact that you, let me check my list here, COMMITTED GENOCIDE, USED CHILD SOLDIERS, AND ABSOLUTELY WRECKED ANY CHANCE OF PEACE BETWEEN DIMENSIONS!!! All to, lemme just see here, a fractional chance that you could bring back your daughter! One person! A person who, if I'm recalling correctly, SACRIFICED HERSELF FOR THE SAKE OF PEACE!!! Did you think she'd be proud? Or grateful? Did you think she'd be happy with you doing this?"
Just an utter verbal (and physical) annihilation. Brownie points if his dragon has been surreptitiously rescuing the bracelet girls in the background, and more and more of the Lancers have been coming in, so by the end, there's like, fifteen people bearing witness to this absolute bloodbath.
Extra brownie points if Ray takes over Yuzu to join in on berating Leo
Extra extra brownie points if the two then team up to beat Leo up.
All the brownie points if Yuto and Yugo are revived to also witness this scene.
Other things Zarc could touch on:
"Let's talk about your quality of staffing, shall we?"
"Everything would have been fine if you had done nothing!"
"Also, there were five hundred alternatives to stopping me! Why did you go with the suicide option?"
And any other ideas you guys might have in the comments.