As Campanella Fruhling's train speeds on, Bishop gives Heine more clues to his past. But the aims of Bishop, who wears his own "collar," are unclear: why is he revealing these things now, and why did he save Heine in the first place?

As Campanella Fruhling's train speeds on, Bishop gives Heine more clues to his past. But the aims of Bishop, who wears his own "collar," are unclear: why is he revealing these things now, and why did he save Heine in the first place?