In the middle of the Great Goblin’s great chamber, poof! Gandalf works some of his pyrotechnic magic to effect a rescue.  I’m certain that this moment of special sound effects was designed to break tension by causing at least one young listener to shriek with audience-fear and delight at being startled.  It relieves the scene of danger with a moment of fun.

• 04.035 and the great fire went off poof!