Montag kills

I believe Montage killed Beatty because he was threatening Montage and Beatty asks Montag why he even has books and so Montag doesn't answer him so he hits him and Montags ear piece come out and Beatty picks it up and then notices that Faber is talking but he doesn't know who he is and that's why he says that he is going to find his little friend to and so that's when Montag gets mad and pulls the trigger.