TT: What exactly does the Scratch do, then?
It resets the game.
TT: Oh.
TT: That’s it?
Yes.
TT: Then,
TT: We all start from the beginning again? When John entered?
No.
The release of temporal energy will be quite massive.
This is a hard reset. It will reboot the conditions in your universe well before you began playing the game.
You will have lived different lives after the reset. The different initial conditions will ideally lead to a more favorable scenario in the new session.
Unfortunately, you will have no memory of anything that has happened in the session you are in now.
TT: What will happen to us? Everyone in this session now?
You will all cease to exist completely if you remain here during the Scratch.
TT: This seems familiar.
TT: It reminds me of when Dave and I were trapped in the doomed timeline, and he left to change the past.
TT: The timeline ceased to exist, along with my dream self, who in a way became merged with my dream self of this timeline. I kept some of her memories.
TT: Is the situation similar?
Similar, but more severe.
Since this timeline will undergo such a violent upheaval, such a merger of memory cannot happen.
You will be resigned to absolute oblivion.
Unless you can discover a way to preserve yourselves.
But it’s not really my place to advise you on that.
After you have dealt with the Scratch and the sun, what happens to you is not any of my business.

I would find this more worrisome, except at this point I’m assuming that the kids get into the trolls’ world to protect themselves from obliteration. 

A hard reset is really interesting, but I thought the kids’ session was never meant to be successful anyway. I guess that could be determined after the creation of the universe, though.