This is how Princesses Cadance and Twilight captured goes in The Storm of Dark Friendship.
[We see Cadance and Twilight Sparkle strapped to upright boards]
[He approaches the princesses]
Umarak the Hunter: They said it couldn't be done. The Princess of Love is too quick, too stealthy to be captured.
[Umarak cups her chin]
Umarak the Hunter: Well here you are with a rare opportunity to make history.
[He lets go]
Umarak the Hunter: You see, I have intercepted this encrypted signal. And if it's encrypted, it must be important. Decode it for me and I will see to it that you remain alive.
Princess Cadance: You won't get away with this.
Umarak the Hunter: Speak up. I can't hear you when you whimper.
Princess Cadance: [a bit louder] I said you won't get away with this!
Umarak the Hunter: [gasps then laughs] Perhaps you will be more inclined to operate when it's not your own wellbeing at stake.
[Cadances looks at Twilight]
Twilight Sparkle: Don't worry. We'll get out of this somehow.