The Hobbit
what did gandalf do to save his friends
chapter 4
chapter 4
When the Great Goblin rushes towards Thorin, Gandalf causes the lights to go out and white sparks begin to burst into the air, burning holes in the goblins. His sword flashes and kills the Great Goblin, and then he says "follow me quick."
http://www.gradesaver.com/the-hobbit/study-guide/summary-chapters-1-4