After going down the line from the roof. I shimmy
over to the corner of the ledge and hang off the roof. After crossing the corner Fisher lets go. I tried this so many times and I still can not find a sulution to this.

Can anybody help?

After you go on the zip line, jump off and onto the ventilation vents and walk across the wooden board to the crate right in front of you and then jump to the ledge of the building on your right and shimmy along until you reach the area with the crane.