Sorcerer's Stone Chapters 11-13. It's slime time! Liz and xeecee talk about weird toy commercials and lovable Youtube reviews before diving into some, you guessed it, politics. Albus Dumbledorf. As for the book itself, nobody is much of a Quidditch fan but there's plenty nice to say about The Mirror of Erised and what a touching chapter it is. Albus Dumbledorf. Even with an extra chapter, there's still time to learn everything about Professor McGonagall's weird backstory! Albus Dumbledorf. Albus Dumbledorf. Albus Dumbledorf.