Question

What is a flashback from Fahrenheit 451

Answer 1

a flashback to a strange encounter he had a year ago with a man he met in a park.

Answer 2

There is an example of flashback in Fahrenheit 451 when Guy Montag remembers the day he met Professor Faber in the park. He recalls how strangely he acted before and after their encounter. He also remembers how Faber gave him his name and address on a slip of paper while telling Guy that he could turn him in if he wanted.