Both Batmen respond to seeing the Bat signal in the sky of the cannon version of DC Universe Gotham. The real Batman meanwhile is, I don't know, somewhere else pulling of some ridiculous feat. They both arrive at the same time and come to the conclusion that the other is an imposter who has kidnapped commissioner Gordon, because he is not there. Some thugs managed to get onto the roof and turn it on as a prank, kinda like dialing 911 when there isn't an emergency. Thus they, not having this information need to beat up the other to find out where he is.
Standard equipment, know prior knowledge of opponent. Morals on.
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