The fact that these guys seemed to recognize and respond to me while a good distance from the scripted point of quest completion that triggered the event seems to say a lot about Blizzard's scripting. They could have just said "bow in that direction" (which would have been facing the other way), but it appears that they didn't. They appear to actually know who the character(s) who completed the chain are. Or at least that was the impression I got here.
In other news, I can't seem to log on to Aerie Peak right now, which makes me a sad panda. :(