As the Scottish lords prepare to restore dignity to their country by ridding themselves of the "tyrant," in Act V of Macbeth they talk as they await the troops from England. When the British forces led by Malcolm arrive, the Scottish forces plan to meet them by Birnam Wood. As they wait for these forces, Menteith asks what the "tyrant" is doing; he is told that Macbeth, in a mad rage that lacks any self-control fortifies Dunsinane castle.
He cannot buckle his distempered cause
Within the belt of rule. (5.2.17-18)
Angus adds that the blood of his "secret murders" sticks onto Macbeth's fingers and his control of his kingdom is falling apart:
Those he commands move only in command,
Nothing in love. Now does he feel his title
Hang loose about him, like a giant's robe
Upon a dwarfish thief. (5.2.22-25)
Then, Menteith concludes that no one can blame Macbeth for falling apart if all his senses revolt against him, if his guilt devours him:
Who then shall blame
His perstered senses to recoil and start.
When all that is within him does condemn
Itself for being there?(5.2.26-29)
Caithness declares that their troops will purge the sickly commonwealth soon and Lennox agrees, saying metaphorically that they will water the royal flower of Malcolm and "drown the weeds" of Macbeth.