For all those boosting friends at around lvl 60.
Did the search and didnt find anything... My first thread dont flame please etc etc
When you get to just before the dragon boss (normal or walljumping) there are two mobs which when you kill them the guy (sorry this is so vague) jumps off the dragon to start the boss encounter.
If you kill one of these mobs at least 10 seconds (ish) before the other one he will respawn but not aggro. This means the boss encounter wont start. You can just keep on killing these mobs one by one as each respawns to get easy XP and a bit of silver.
Actually found this running my mate through last night and it got a bit annoying as we actually wanted to complete the quest by killing Nazan. I can see how this could be a really good way of gaining alot of xp using a glider or something.