Why did the adventurers cross the mountains? To get to the other side or get away from the psycho with the axe. The eternal question.Sidran said:( How do you do the long dark of Moriah with creature the equivalent of the Balrog chasing the players)
You could use the fact they're being chased, probably for some reason other than to make them run, to "help" them into the adventure. If the huntsman is a polearm, great axe, other fearsome weapon wielding bad mamajama riding a dire wolf, with a small but ferocious contingent of lupins, and or lesser lycanthrops, running is almost always a good idea. But if he can make better speed, particularly over rough terrain than the party, they need to really use that head start. Shelter. An abandon dwarven tunnel rumored to still traverse the mountians even though it had fallen into disuse after a major collapse that is a) near by and b) also rumored to be a virtual labrynth suitible for losing or ambushing their hunter, well that's a pretty solid out.
If an NPC who's either indebted to the PC's, or wishes the PC's to be indebted to him, aids them with this information, all the better. If the PC's happen to learn why they're hunted, or at least for whom, they might then learn that person is on the other side of the mountains. The PC's might find themselves having to race to assasinate their assasins employer and render the contract moot.