Ok after you light the 5 Torches and proceed to the next area, you talk to the Captain, or atleast I think he is the captain, and you begin an Ambush Event. DUring the event the bridge gets pulled up for reinforcements and there is the Event Boss. I am a Witch Doctor and I was using the fire bombs. THIS IS WHERE THE BUG HAPPENED When throwing firebombs at the boss they just fell through the bridge that was hoisted up. They wouldn't explode or deal any damage to him. My attacks just went through the bridge. It's not a big deal but I'd thought I'd let you guys know.