Rinku starts humming Bad Apple too as they keep going. What? She knows it.

When the demon shows up, Rinku tries to talk to it peacefully, but if it attacks she'll strike out with fire -- and immediately stop once she realizes it's hurting Eren. Eren tries to tell them that it's fine if he gets hurt, he can just heal. (He has no idea what a health bar is.) Still, Rinku and Wendy will try to subdue it peacefully by using telekinesis to pull it back and giving everyone (especially Eren) defensive buffs, respectively.

Wendy shines the flashlight in the demon's eyes to try to blind it. Once it's revealed, Eren flies up to try and kill it with its own dagger.