After their defeat, the Dazzlings just collapse to the stage and start crying.

Rainbow Dash walks up to them, and asks them why they're overreacting so much.

Aidago looks at her and says, "Those pendants were 'Soul Pendants'. They were the physical representation of our souls. You just destroyed our souls."

---

What's the Rainboom's reaction to that news?

7472225
"What did we do?!"

Twilight would likely step up along with sunset and they would give them an ultimatum. Reform or be left to their fate.

The sirens had every intent on ruling the world and turning humanity against one another and they've been alive for thousands of years. Death is kind of overdue for them at this point. However if they promised to reform and use their voices for good? I'm sure twilight and especially Sunset would want to help them.

7472225 There was a Doctor Who episode in the Tennant era about a species who had a hind brain outside their bodies, which they carried in their hands. It was pointed out that such creatures, with such obvious survival weaknesses so exposed, would have to be the gentlest, most trusting creatures you'd ever meet. Which does bring up the question of what exactly the sirens would be doing riding into battle with such an Achilles heel on full display.

7472225
She's scoff at your edginess then make out with Adagio.