 Studying William Shakespeare Macbeth? Let's discuss Macbeth's growing paranoia when he realises that Pheonce escaped in spite of Banquo being killed. In Act 3 Scene 4 the murderer confesses Pheonce has escaped. Macbeth goes from being incredibly happy to saying, then comes my fit again and the caesura here shows he's suddenly changed. This is a turning point. The similes holds the marble found under the rock show that before he learned that Pheonce had escaped he was absolutely happy and fine. He says he feels cabined, cribbed, confined. And this is Rule 3 as well as alliteration of sea. This shows that Macbeth now feels trapped by his fears inside his mind. His references to Saucy doubts and fears show he's increasing mental paranoia, knowing that Pheonce, who is Banquo's descendant, might take over and come back as king. The alliteration of B when he asks, but Banquo is safe, shows he's trying to gain composure, he's trying to find some kind of comfort in knowing that Banquo is dead.