Gandalf the White vs Michael
Gandalf the White, from the third part of The Lord Of The Rings
VS
The Archangel Michael, from the film Legion
They are fighting in the Colosseum. They are fighting to the death, or something to similar effect. They know nothing of each other prior to the fight. Neither of them is held back by any wizard or angel rules, they are both going all-out. There will be no outside interference. Gandalf is in White-mode, obviously, and is armed with his staff and Glamdring, and Michael has his wings and is armed with his own sword.