In the past, Kitty has quite appreciated Bartimaeus' chattiness. Honestly, it's - well, frankly, it's saved her life. But right now, it's so utterly obnoxious that she's half tempted to push him down the stairs. Three times - three times, she opens her mouth to interject, but he just keeps on with his outrage, listening to no one save himself. So finally, when he's done, she's finally able to cut in to say -

"I can't have summoned you, Bartimaeus. We're not on earth."