Batman versus John Preston...
Preston is busy killing room after room of sense offenders. He starts at the ground floor and is working his way up. He has his twin pistols and his katana.
Batman is fighting his way through them H2H, the Joker has escaped Arkham and Batman believes he is in the same building. Batman starts on the top floor and is fighting his way down.
They meet in the middle. Preston, thinking Batman is a sense offender, raises his pistols, and CLICK, they have ran dry, and he is out of ammo.
Batman goes lulz and attempts to apprehend Preston.
Preston draws his sword and attacks. Who wins? To the death for Preston, for Batman, seeing as how he doesn't kill, to the win.
Batman is TDK Batman, with the updated armor and all the gadgets. No sonic screech bullshit device.
Fight takes place in a large room, fully lit, in broad daylight.
Scenario one: As I described.
Scenario two: Batman has a katana.