This is how Twilight vs. Thunderwing goes in Twilight's Kingdom.
Twilght Sparkle: I can do this.
[She levitates a heavy boulder]
Twilight Sparkle: That wasn't hard.
Twilight Sparkle: [growls]
Thunderwing: PRINCESS TWILIGHT!
Twilight Sparkle: [gasps] Thunderwing!
Thunderwing: YOU HAVE SOMETHING THAT BELONGS TO ME!
[Twilight fights him]
Thunderwing: You're going to give me what I want.
[She fires a beam of magic]
Thunderwing: Not bad for a librarian. Perhaps you should've spent more time in the pit.
Twilight Sparkle: And perhaps you should've spent more time in the library.
[They continue fighting until Thunderwing gains the upper hand]
Thunderwing: It appears we are at an impasse. How about a trade, Princess Twilight?
[Rainbow Dash, Pinkie Pie, Rarity, Applejack, Fluttershy, Spike, Princess Celestia, Princess Luna, and Princess Cadance appear in cages made of Dark Energon above Thunderwing]
Thunderwing: Their release for the biggest chunk of Dark Energon in Equestria.
Twilight Sparkle: [gasps]
Thunderwing: What's it going to be, Princess?
Thunderwing: ENOUGH! I want an answer and I want it right now!
[Twilight flies towards him]
Twilight Sparkle: I will give you the biggest chunk of Dark Energon in exchange for my friends.
Thunderwing: As you wish.
[Thunderwing releases everyone except Princess Luna]
Twilight Sparkle: All of my friends.
Thunderwing: After that incident when she was Nightmare Moon, you call her a friend?
Twilight Sparkle: Release her!
Thunderwing: If that's what you want.
[Thunderwing releases Princess Luna]
Princess Luna: Oof!
Thunderwing: Now, the Dark Energon.
[Twilight gives him the Dark Energon]
Thunderwing: Ah, my Dark Energon.
[Thunderwing grabs the biggest chunk of Dark Energon and puts it in his core and becomes more stronger]