and change change change is gonna come but

This isn't an argument that Kitty really wants to have. No, really, you're stupid, he's dead - Why would she want to fight to make Bartimaeus believe that? The smart thing here is to just shrug and say all right and let Bartimaeus carry on with his searching until he finally comes around to logic. And yet, she can't help herself - she bites back -

"How would you know, exactly?" She shakes her head. "How would that work?"