Exams and Other Worries
Hermione tries to discuss her History of Magic exam with Ron, and Harry wonders about the twinges in his [scar]. Suddenly, though, he realizes that in order to get his dragon egg, Hagrid must have told the stranger about Fluffy.
Harry confronts Hagrid about how he got his dragon egg, and Hagrid unwittingly tells them the same thing he told the stranger who gave him the egg: how to get past Fluffy. The trio then bolts for the castle.
Trying to find [Professor Dumbledore], Harry, Ron, and Hermione instead learn he is gone and confront Professor McGonagall about the Philosopher's Stone. She, however, is unconcerned and sends them back outside.
Harry, Ron, and Hermione resolve to guard the [third-floor corridor] and Snape for themselves, but Hermione's attempt to guard the staff room is thwarted by Snape and Ron and Harry are caught outside the [third-floor corridor] by an angered McGonagall.
Going After the Stone
The trio quietly walks to the [third-floor corridor], thwarting Peeves on the way, and find it already opened.
Caught in [Devil's Snare], Ron starts to panic, Hermione realizes she needs a fire, and Harry and Ron remind her she can produce one. She lights a flame and the plant recoils, dropping them all to safety.