Agree with VasHy, thought no way it would happen because that sounded like twist for twists sake, but yeah it happened and it actually served a purpose. Also means we can't trust nina's appearances in the future or potentially the past, and if Johan is used to this then that could explain why they thought there was only one child during the mother's stay at 3 frogs.
On to this chapter, Grimmer confirmed not on Johan's side and same with detective which means they can def die here. Also Grimmer's intuition is insane and reeeally hope he sticks around.