Beatty wanted to die.
“In the middle of crying Montag knew it for the truth. Beatty had wanted to die. He had just stood there, not really trying to save himself, just stood there, joking, needling . . .” (p 174 in my edition; 20 or 30 pages earlier in yours).
Do you agree that Beatty had a death wish?
If yes, then did he really believe he was enforcing happiness as he claimed?
If not, what motivated him to keep taunting Montag?
Check out the homework page for your assignments. The main one is to write your body paragraphs for the essay on Fahrenheit 451.