Go to the arena and find the motorbike at the front of it. Ride it to the fireworks store at Silver Strip and get rockets from there. Then ride the bike to the alley with the maintenance room and get a metal pipe. Now ride the bike to the rock canyon and enter the maintenance room in the rocks and create a rocket launcher. When you have created a rocket launcher exit the door of the maintenance room and stand in the left side corner and save the game. When Leon appears from the left side he will run into the wall. Use the rocket launcher you created and keep shooting at him until he has been killed.
Added by: Sanzano Oct 6th 2010, ID#15417