they try to kill Smaug(the Dragon) by pouring liquid hot gold on him. it looks like it's killing him but he escapes, flies out of the cave and starts heading towards a nearby town to destroy it and kill everyone. The Dwarves and Bilbo look on like Then Bilbo says, "What have we done?" then fade to black, when it faded to black some dude behind me was like "Are you kidding me?!"