That girl down the street was hit and killed by a car four days ago!
One important incident in Fahrenheit is when Montag first meets Clarisse. Her question, "Are you happy?" Montag to start to question himself.
Another important event in the passage is when the old woman throws herself into a fire. This begins to make Montag wonder why books make people do this sort of thing, as well as make him nervous about his seceret stash of books in the vent.
Time to get out of here!
A third important event is when Mildred reveals to Montag how Clarisse is dead. When he hears how she was killed (hit by a car), it is driven home to him how messed up his society is.
Yet another important event is when Montag reunites with Faber, a retired English professor. Together, they come up with a plan to destroy the fireman system.
In this important scene, Beatty discovers Montag's book is stash after Mildred betrays him. Montag is then ordered to burn his own home. Afterwards, Montag kills Beatty and runs away from the city.
After he runs away from the scene of the crime, Montag meets a group of people who memorize books. Just as they are about to head over to the next town, jets fly overhead, destroying the entire city. Montag and the others escape from city.