What does Angier think of Harry Cutter's explanation for Borden's New Transported Man illusion?

Harry Cutter, Angier's ingeniuer, advises Angier that Borden is using a double for the illusion; specifically, an identical twin brother. Angier is pacified with Cutter's explanation for a short while - until he meets reporter Author Koenig, who has checked up on Borden and can assure he has no twin brother. Koenig even provides Angier with his own notes in order for Angier to research for himself.