Get the motorbike from the front of the arena. Drive it to the fireworks store at Silver Strip. Get rockets and ride the bike to the alley with the maintenance room. Get a metal pipe and ride the bike to the rock canyon. Enter the maintenance room in the rocks and create a rocket launcher. Exit the door of the maintenance room and stand in the left side corner. Save the game. When Leon appears from the left side, he will run into the wall. Shoot him with the rocket launcher and repeat until he has been defeated.