This is how Umarak captures Rarity and Pohatu vs. Umarak goes in My Little Pony: Umarak's Revenge.
[Rarity and Pohatu prepare to attack]
[Umarak gets out his Bone Hunting Bow Shooter and blasts Pohatu away. Umarak then uses the shadows on Rarity]
[The shadows move Rarity to Umarak and forcefully unites her with him]
Umarak the Hunter: Fool! I control your friend. I control your elements.
[Umarak throws a large rock at Pohatu, who shatters it]
Pohatu: You do not control Rarity. I can feel her fighting you.
Umarak the Hunter: I have the mask and you are alone.
Pohatu: No I'm not!
[Umarak then begins to feel pain as Rarity zaps him with a beam of magic]