Board Thread:Lore Discussion/@comment-68.45.229.57-20130720115140/@comment-24327466-20131225011431

Killing Gelebor renders the bow inaccessible. Moving the bow means they can't find it the same way you did, finding it at a random point on the bottom of the ocean is much more difficult. Killing Serana means they don't have the blood. Don't confuse the "good" choice with the "right" choice, I see no conceivable reason why my dark brotherhood assassin/ vampire slayer decided to make Serana his best friend.