To defeat Salazar the easy way, just buy the rocket launcher from the merchant. you need to shoot Salazar from a distance and avoid going down to the bottom of the room. you need to use the following weapons to get Salazar to come out that cage thing The Mine Thrower, and the Riot Gun(if it's not available, just use the Shotgun). when he pops out of the cage thing, get out your Rocket Launcher and FIRE AWAY! It's a lot easier and saves time!