How does Shakespeare's use of figurative language in this excerpt affect the play?

The Sergeant's use of a simile when he compares Macbeth and Banquo to "cannons overcharged with double cracks" stresses the fact that they are flawed men.

The Sergeant's use of personification when he states that his "gashes cry for help" reinforces the idea that the battle he witnessed was brutally violent and dangerous.

Duncan's use of a metaphor when he refers to getting the Sergeant "surgeons" demonstrates that he is a king who does not want to be involved in the messy consequences of warfare.

Duncan's use of imagery when he describes how the Sergeant's injuries "smack of honour" conveys the idea that he values the Sergeant more than he appreciates Macbeth or Banquo.