There is tension. And then the child is born, one who, we are told in a quote from Psalm 2, will rule the nations with an iron sceptre. All other forces and all other rulers are just like cheap bits of red clay pottery compared to the power of the one with an iron sceptre. There is none stronger than the one with the iron sceptre, not even a dragon with seven crowns and ten horns. And the dragon knows that full well.
Enemy prepares to meet enemy.
The eternal destiny of both is at stake. There is only room for one eternal ruler. The child, of course, is Jesus Christ, the Messiah - born out of the Old Testament People of God, born into the world to confront that pretender to the Cosmic Throne of Power, the dragon, the devil. The prophecy is brief - a description of the life and ministry of Jesus is not given. That we can find from many other places.