http://revach.net/article.php?id=4339

Section: Daas Torah   Category: Rav Shimshon
Parshas Yisro: Rav Shimshon Pincus - Only Hashem Can Pay Back Midda K'Neged Midda
Rashi says that after Yisro saw Hashem Punish the Mitzrim Midda K'Neged Midda he then declared, "Ata Yadati Ki Gadol Hashem MiKol HaElokim", I now know that Hashem is greater than any other power.  What is it about Midda K'Neged Midda that makes Hashem so unique, is it the ingenuity?

Rav Shimshon Pincus explains that every Koach in the world only has its own power to use.  Fire can fight water with fire only, and not water.  Aside from the fact that this is its only capability, it also wants to show tis opponent what makes it unique.  It cannot use power that it doesn't have.

Hashem works the opposite way.  To show fire who is boss, Hashem uses fire to fight fire.  He use water to fight water.  This unique fighting strategy shows that Hashem is more powerful than any other force.  Moreover it shows that He is the only force, and the force behind all forces.  In a way this doesn't counter the above logic, it works with it.  Hashem fights each element with His unique force.  He is Echad Yachid U'Miyuchad and every possible force is His. And He shows it to everybody as needed.