Leon versus Batman...
Leon is the best assassin in Gotham City. He is offered a substantial amount to kill a mafia witness in protective custody. Leon arrives to complete his assignment, but, when he enters the room, Batman comes crashing through the window. Turns out that his employers have sold him out, tipping off Batman that he would be there.
They are on the top floor of Nakatomi Plaza (Die Hard), and Leon has to either kill Batman, or simply escape. Batman must take Leon alive.
Leon gets his two pistols and unlimited ammo, along with the weapons he had on his vest in "The Professional." Batman gets the same suit he had in Batman Begins. No sonar, no vehicles.