In the level WEATHERTOP you have to fight the black riders (ringwraiths) before they kill Frodo. If you hit the black riders they will keep blocking. There is a small campfire. Go near it and keep pressing the TRIANGLE button till your stick catches fire. Now go and hit the black riders. They will catch fire and eventually die. A high pitched scream will indicate their death. Once the fire from your stick is gone, go back to the campfire and get fire again (TRIANGLE).