Monster Madness

On the catacombs level in chapter 4 after you beat the Vampires's monster fest, a little bit further down the tunnels there is a huge room with a huge ball. You will need to dash around that room until the ball kills all 56 monsters in the monster fest. You need to do this without shooting a single bullet or using a single grenade, powerups are ok though. Some enemies are slower than others so you will have to time things correctly.