"Is this a dagger, which I see before me, the handle toward my hand? Come let me clutch thee. . ."
"I'll go no more."
"Infirm of purpose! Give me the daggers. The sleeping and the dead are but as pictures. . ."
Macbeth and Lady Macbeth begin to carry out their plan to commit regicide, however Shakespeare begins to illustrate that Macbeth is losing his mind and sanity to carry it out but nonetheless proceeds as planned.
"O, yet I do repent in my fury, that I did kill them."
A shaken Macbeth, meets his wife at the castle's courtyard once the deed has been done. But, horrified of his own deeds he left out the act of framing the guards prompting Lady Macbeth to finish the deed.
". . . I'll to England"
"To Ireland, I. . ."
King Duncan was soon found dead, murdered by daggers (and treachery which is unbeknownst to most of the characters). Everyone searches for the killer(s) while the real traitor hides (guiltily amongst them).
Macbeth in both guilt and madness killed the two guards which 'supposedly killed' King Duncan before anyone can question them. Macbeth states he did it out of love for the King (another lie Shakespeare used to tell how far Macbeth has gone). The group realizes that the Guards were 'paid to do this', which leaves the real question of who truly murdered the King.
The King's two children Malcolm and Donalbain decide to leave Scotland, to avoid suspicion of being prime suspects of their father's murder and to protect their family and legacy. Which is a extremely wise decision which is very similar to how Duncan as a character would have done.
While Shakespeare did not include Macbeth in this scene and used supporting characters instead to explain the current situation. As noted with both the King's Children leaving Scotland, many suspect them to be the murderers of their father. Macbeth was named and to be crowned as king, which symbolizes that he fell to his own flaws and greed. The hero has become a villain.