North of Drake Knight Ilthain

First crack at multplayer last night (2 person). We had talked to Ilthain and proceeded up the hill after his dragon took flight. My teammate was downed and me not really understanding the mechanics without revive tokens proceeded to clear the enemies from around us. I did not venture too far up the hill to avoid aggro of more enemies. It claimed him as dead, therefore I could not revive and said the area was not clear for him to revive?