What I've written so far...
Chapter Seventeen:
Albus arrived at the library. He looked left and right, then spotted Scorpius.
"Hi." said Scorpius.
"Scorpius. I can't…"
"I know. You're in Gryffindor now, but I'm still here, talking to you."
"Well, I can't talk, so…"
"You have to. You think you can ignore everything that's just happened? The world has gone crazy, have you noticed?
"I know, okay?" said Albus heatedly, "Ron's gotten all serious, Hermione's a professor, it's all wrong, but…" he trailed off, not knowing what to say next.
"And Rose doesn't exist. Because of what we did, Rose wasn't even born. Do you remember being told about the Triwizard?