Mikasa took the shackles and opened the cage.  At first glance it didn't look like she'd be able to fit in there with the elf, but with a bit of shuffling and gentle squeezing, she was able to get herself inside.  Looking around, she decided the best way to fit would be to stretch and shackle her arms to the bars on top of the cage, so her arms would be out of the way.  "I think you could fit another elf girl in here like this, but it's tight," she said once she had successfully shackled herself to the bars in the cage's roof.  "Oh, I think I forgot to get the key.  Can you guys unlock me?"