u can also talk about the quickness of the scenes that are around the Battle of Actium, and the land battle after that.
dramatic irony lends itself to the structuring of the play, where we are privy to, as an audience, to the heart and mind of antony -- so when we do see antony fall, we, as an audience feel sympathetic towards him - therefore, we are involved with the powerplay, as if we have some responsibility in his downfall - that is one example of powerplay in action.