This is how Thunderwing captures the Princesses in Thunderwing's Revenge.
[Thunderwing arrives at the Canterlot castle to steal the Alicorn magic from Princess Celestia, Princess Luna, Princess Cadance, and Princess Twilight Sparkle.
Thunderwing: So you're Twilight's brother and Cadance's husband?
Shining Armor: Yes.
Thunderwing: Well, your magic should be stronger than any other.
[Thunderwing then drains Shining Armor of his magic]
Shining Armor: No!
[Thunderwing then goes to the Canterlot Castle and tears the doors off their hinges and tosses them aside and approaches the Princesses and grabs Princess Celestia and tries to drain her of her Alicorn magic]
Thunderwing: What? Nothing's happening. What have you done?
Princess Celestia: Don't have any magic.
[Thunderwing then grabs Princess Luna and tries to drain her of her Alicorn magic, but comes with the same result, then tries Princess Cadance, again same result, and finally Princess Twilight Sparkle, same result]
Thunderwing: WHERE IS YOUR MAGIC?!
Princess Cadance: It's gone.
Princess Luna: We gave it to someone else.
Twilight Sparkle: To protect it from you.
Thunderwing: Getting rid of your magic so that I cannot take it from you? That was your plan? How does it feel, knowing that soon, every Pegasus, Unicorn, and Earth Pony will bow to Unicron's will, and that there is nothing you can do to stop it?
Princess Celestia: You will not prevail Thunderwing.
Thunderwing: That's what you think.
[Thunderwing then creates cages out of Dark Energon and imprisons the Princesses in them]
Thunderwing: And how you three like to know that I was controlling Twilight Sparkle's mind and forced her to revive me?
Princess Celestia: No.
Princess Luna: You won't get away with this.
Princess Cadance: We won't allow it.
Thunderwing: And I bet you're wondering how I got in Twilight's mind.
Princess Celestia: How did you get in Twilight's mind?
Thunderwing: Knowing I would be defeated, I inject a Dark Energon shard containing my mind into Twilight's cutie mark.
Princess Celestia: When did you do that?
Princess Luna: How did it get in her body?
Princess Cadance: Why did you do it?
Thunderwing: For the Sun Princess's question, it was during the final battle with me. And now that she has revived me, I'm just returning the favor.
[Thunderwing than sees the stain glass window with Ryan F-Freeman on it]
Thunderwing: Is this meant to be humorous?
Princess Celestia: No.
Thunderwing: The techno-organic is here?
Princess Celestia: Yes.
Thunderwing: If he has the Alicorn magic, then I shall FORCE him to give it to me. And I know just the ones to use to force him to give me the Alicorn magic. I already have you four. I just need Twilight's friends.
[Thunderwing then destroys the stain glass window with Ryan F-Freeman on it]
Thunderwing: He will give it to me, even if I have to force him to.