I believe the possible interpretation is: Napoleon demonstrated his power to the Pope and world.
The significance of Napoleon Bonaparte taking the crown from the Pope, and crowning himself as Emperor of France was the demonstration of power. Papal supremacy is the doctrine that had the most significance in the relationship between the church (spiritual) and the temporal (worldly) state – they influenced actions of monarchs and even successions. Taking that into consideration, Napoleon’s act of crowning himself was the demonstration of his power, he proved to the world that no one is above him, not even the Pope.
