On the Compelling Tribute Quest. When going to meet Hadvar, I came around the backside of the mountain. Instead of finding Hadvar, I found the Stormcloaks. So I killed them all without speaking with Hadvar. I picked the lock on the chest in the caravan, took everything and sold it. Then realized, I was supposed to speak with Hadvar. But, I cannot. He stands there and tells me to prepare to fight the Stormcloaks. I cannot progress with the quest unless I speak with him, but I am unable to. Any ideas?

Edit: I fixed it by pressing start, selecting load, and loading a save from three hours before. So, I spent another three hours getting back to where I was at. But I did get it done right this time. Remember people, save and save often!