Here's what happened:
I'm fighting the guy who carries Logan's Scroll. The enemy has only a little health left but so do I - I run off to heal. While I'm healing I hear the death sound.
I run back up to the roof and the enemy is nowhere to be found. Neither is Logan's Scroll.
My only idea is that he fell off the building. I don't have any poison weapons so he didn't die due to an effect.
I've searched everywhere. On the roof, the room below, and the ground. Nowhere is the scroll to be found?
My whole run is based on getting that scroll and I've put in over 50 hours. Did I just F- up everything?