This needs to be completed before you make it into the Library you are directed to after you make it to the Abbey. There is a very large restricted area around the entrance you need to reach. In that area you will find a lot of places you can hide in. Take a moment to study the patrol patterns and use the Mark ability within Eagle Vision. You can enter the striped green area without this going away.
You have until you leave the abbey to complete this.
- Don't get into conflict
- Play organ (Distraction Opportunity)
- Let the allies do the job (Assistance Opportunity)
- Cover kills 0/2