Lennox is deeply suspicious of the chain of events which have recently occurred-
only I say
Things have been strangely borne
He considers each of the murders of Duncan and Banquo and is not convinced that in each case the fathers were killed by the sons. He also implies that the murder of Duncan's guards was a way of silencing them as well as retribution if they were involved in the king's murder-
Was not that nobly done? Ay, and wisely too,
For ’twould have anger'd any heart alive
To hear the men deny't.
He notes that Macbeth is a 'tyrant' and that the nation is suffering under his rule.
Malcolm has gone to England and has been well-received by King Edward. He is organising an army to help him to win back his 'birthright'.
Macduff has refused to be part of Macbeth's army, which he is amassing out of paranoia for his precarious position. He will join with Macduff, and Lennox and the lord pray for the nation to be released from the 'cursed hand' of Macbeth.