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Certainly this scene speaks to why Macbeth is really inept as a murderer. He bounces around themes that include the afterlife, state of mind, hesitancy....We get the sense that Macbeth is not cut out for the whole cold blooded murder racquet. Macbeth obsesses about the ethics of murdering a King,
"First, as I am his kinsman and his subject,
Strong both against the deed; then, as his host,
Who should against his murderer shut the door,
Not bear the knife myself."
He does so much analyzing that this passage foreshadows how murdering the King will not go so well with our protagonist.