After I a long fight the dragon fell to its knees, and died. I then gave both Gelda and Faendal a proper send off, by dragging them into the fast flowing river. I watched as they disappeared further and further from view, until they went over the waterfall... it was a sad day.
My point is: common NPC's should attack a goddam dragon, they should run for their lives, trying to get inside. I'm just glad Alvor survived.