It appears that, since Six is no longer wearing any of her many hats in Little Nightmares 2, she can see Mono for who he truly is, or rather, she might finally be able to see him for what he eventually becomes. However, it turns out Mono has a very good reason for seemingly killing her new friend.
The heroine seems to take a rather dark turn it even looks like perhaps she's turned bad.
This time, after catching Mono, Six lets him go and the blob of eyeballs ends up catching him. That makes this particular twist that much more painful. The moment in Little Nightmares 2 mirrors several other scenes throughout the game where Six has saved her companion from falling and dying. Six lands safely and successfully, and is able to turn around and catch Mono just as he's about to miss and fall. Eventually, the two need to make a rather big jump over a deep crevasse.
Six is transformed by Mono into her regular form, and this allows the pair to stay just ahead of the disgusting villain. Mono saves Six from the clutches of the game's Big Bad, the mushy blob of eyeballs. As the penultimate scene in Little Nightmares 2 unfolds, it seems as if players are going to get to see both characters run off into the sunset, or in this case, the sunrise.