Eventually all of the enemies will be gone, which will spawn two snipers in a tower on the other end of the courtyard. Stay close to Cutter and take out the few enemies you encounter.
Zip-line across and you will be separated from Chloe and Sully.( Note: This is a good spot to earn 30 Kills: Dragon Sniper Trophy) Standing behind the pillar doesn't cut it some RPGs can still take you out there. It is best to take cover on the lower platform. Take cover, and use your sniper to take out the enemies one by one. Run forward to dodge the RPGs, and pick up the Dragon Sniper at the end of the path.Move the camera around until it is pointing at the North Star, and then when prompted, drop the camera directly below that to a door. Stand on the circular symbol and press L1 to look through the scope. Follow Cutter up the small set of stairs to trigger a cut scene. Go in the door and climb up the tower.(Note: This is a good place to get the Brute Beater Trophy). Go around and open the door on the inside wall. Shoot down the two enemies on the other side of the floor. Take out the three enemies to your right and take cover.Continue climbing and swing around to a window.With the enemies on the roof gone, continue up the tower and as you get to the next larger sized rock 2 more enemies will apper from the right, one of which has a laser scope.Enemies will start shooting you, but the stone you are under acts as cover. Swing on the chain to jump to the next one, and then jump to stone.Climb over this, and two enemies will blow you out of the tower. Try going up more stairs to the third floor, but you will be stopped by a falling rock.The easiest way to take them out is by going around the room counter-clockwise and using your Mag 5 and melee to take them out. There will be enemies here that you can not take out with stealth. When you are ready, go up the stairs to the second floor.
TREASURE 39: Going around the room clockwise, the Midieval Lead Horseman is in the third window.