"We have to try, or we'll never know," Takahisa said, knowing that there wasn't any other way if he wanted to. This idea he had was for sure permanent while any other method would only be temporary like this tree prison he made. In relation to Takahisa's words, Armin would see that the small flame in the green crystal become more radiant, representing Takahisa's will to do something about Ayimu himself.
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Kaika stopped at the trapdoor, but knew that it was locked as she saw a bit of chain and a lock. Kaika was always prepared though, taking out a small bobby pin and carefully using it to pick the lock, and it didn't take long for her unlock the lock. She carefully removed the lock and chain, making sure she doesn't make too much noise. Then she opens the trap door and peeks a bit to see if there was anyone in the 2nd floor of this building. It was clear, so Kaika gave a signal to Eren before jumping down and landing without a single noise made.