Optional Missions:
- Sabotage 3 alarm bells
- Visit 2 old friends
Shake the cage by pressing any button, do this until an assassin releases you. You'll get your hidden blade and blowpipe back which will allow you to sneak in the fortress and utilize stealth. For your first optional objective, you have to sabotage three alarm bells before reaching the prison building. The alarm bells are close to stalking areas so you'll have a good position eliminating the guards silently and cleanly.
One alarm is located a few steps away from the gibbet where you were held, along the main path. The next one is located on the right side of the fort, beside some stalking areas near the wall. The last one is located in a guarded area right before the prison door. Don't forget to check the gibbets near the beach to the southwest. Examine the skeleton there to find Rackham's remains; this will update your secondary optional objective.
You can pretty much choose what approach you want to do. If you haven't cleared this area before, it will help synchronizing with the viewpoint to clear the map. Make your way to the prison gate to find the last alarm bell. You can use your darts to clear the area easily and allow you to sabotage the alarm bell.
Enter the prison and continue until you reach the first set of cells. You will find Vane in one of the cells here so talk to him to complete your second optional objective. Continue along the corridors and take out the guards along the way. When you reach the second large room with the prison cells, you'll find Mary and Anne being harassed by the guards. Eliminate the two guards outside her cell by jumping up the bars above and performing a double air assassination or simply pick up a weapon and engage them in battle.
Get her and make your way to the exit. Assist Mary on your way to the waypoint outside, putting down Mary every time there are enemies so you can engage them. Continue until you've reached the boat and mission marker. Mission complete.
Jack Rackham's body is hanging in a cell,by the beach, to the southwest, there's a fast travel location on the side where the cage can be found
On mine it says I have to visit 2 old friends where is the other one?