When you talk to him at Dawn (the one to the right of the ladder at the base of the mountain), it should trigger a sequence automatically (and you don't have to run up there yourself). Perhaps you're not talking to him at Dawn?
I think we saw what you meant! We just posted a new update (Version 1.0.2) which should correct that problem. I managed to do it too, and it seems to be working in the new build!
