The nobleman Lennox discusses Scotland's plight with another lord. Isn't it weird that Duncan was murdered, that his run-away sons were blamed, that Banquo has now been murdered, that his run-away son (Fleance) is being blamed, and that everyone has a major case of déjà vu. Plus, the murders of Banquo and Duncan were too conveniently grieved by Macbeth, who had the most to gain from the deaths.
They call Macbeth a "tyrant," and then note that Macduff has joined Malcolm in England.
Malcolm and Macduff are doing a pretty good job of convincing the oh-so gracious and "pious" King Edward of England, along with some English noblemen, to help them in the fight against Macbeth, the tyrant.