 Studying Macbeth, here's how you can analyze Banco's growing doubts about Macbeth in Act 3, Scene 1. Banco is alone and he reflects that Macbeth has to now. King Cordo Glamis. Shakespeare's use of Cesura here as well as the rule of three show that Banco is wondering whether Macbeth has done something to become powerful this quickly. He says I fear thou placed most folly for it. In other words he's worried that Macbeth is the one that actually did the killing and the litteration of F as well as the reference to foul echoes the witch is in Act 1, Scene 1, who said foul is fair and fair is foul. But he also remembers that the witch is prophesied about his children and we can see that Banco kind of hopes that his kids will also be kings. This rhetorical question further emphasizes his hope that his children will be kings. Yet this exclamatory sentence shows he's going quiet because he sees Macbeth as approaching. What this is illustrating is that he can't trust Macbeth anymore.