Macbeth's words and phrases to the thanes, such as "You know your own degrees" and "Both sides are even: here I'll sit i'th'midst" suggest a renewal of order and symmetry in Scotland, yet the audience knows that this is not the case. Both sides are not even, because Banquo is missing. Degree, or rank order, has been effectively perverted by Macbeth by his killing of the king and his usurpation of the throne. As in Act I, Scene 6, Lady Macbeth's words of introduction disguise her true feelings. Once again, the Macbeths act with suspicious confidence. This confidence is about to desert Macbeth, however, as his dark secret comes back to greet him in the form of the First Murderer.
At first, Macbeth is pleased with the murderer, telling him he is "the best," "the nonpareil" (without equal); moreover, Macbeth's own supposed invincibility is shown when he says that he feels "as broad and general as the casing air," but on hearing the unwelcome news that Fleance escaped his treachery, Macbeth's language abruptly changes: "But now I am cabin'd, cribbed, confin'd, bound in / To saucy doubts and fears" (25–26). The alliteration of the hard c sounds reveals Macbeth's sense of constraint, in contrast to the freedom which he claims to have enjoyed previously.
The imagery of confinement and constraint plays an increasing part in his language from now on. For example, these words foreshadow the point in Act V, Scene 7 when, recognizing that he is physically trapped by the advancing English army, Macbeth cries out, "They have tied me to a stake, I cannot fly" (flee). Now, though, something altogether more terrifying holds him down and prevents him from moving: In the very place reserved for him at the table, Macbeth sees, or thinks he sees, the spirit of the assassinated Banquo.
