carry on was written as if it were the eighth simon snow book , as if it were cath 's job to wrap up all the loose ends , to make sure that simon ascended to mage , to redeem baz ( something gtl would never do ) , to make both boys forget about agatha ... to write all the good-bye scenes and graduation scenes and last-minute revelations ... and to stage the final battle between simon and the insidious humdrum .