So after hanging around Castle Volkihar trying to get at the bone hawk (I want that amulet), I used Kyne's Peace to bring some down. OK cool, collected a few things off them but not enough to make the amulet. Now, for some reason it doesn't work anymore, I can't bring them down. Any suggestions?

Maybe they were out of range when you tried again? You using it from the top of the tower?

I should've stated that. No I'm on the bridge right in front of the castle. They fly low enough so I know theyre in range. Maybe I should go up top. Actually come to think of it, I dont think Ive ever been up there.