To the death.

Scenario 1: Both are in the pit arena from the Jet Li film Unleashed, barbed wire and everything. Both are shoeless and shirtless, and will have no weapons. The fight will be bare knuckle. However, during the height of the match the combatants will be showered with the same weapons that Uncle Bart threw into the pit from the Unleashed film, just to "make things interesting". Both are at full health.

Scenario 2: Both Riggs and McClane are in the Deep Core rig from the film The Abyss. Both start at separate ends of the rig. Both are armed with a single Glock .40 cal pistol with one clip (11 rounds) of rounds. When the rounds are spent, it's straight hand to hand with anything that can be utilized as a weapon afterword. Again, shoeless and shirtless and in full health.

Who takes it?