After clearing them out, proceed onward or drop down and fight the giants if you so please. It’s your choice. Continue to the end and take a staircase that leads to a large archway opening into a building. Take the steps up to reach a rooftop with Silver Knights waiting across the way to shoot you down. Drop down and use the lower edges to your advantage so you can pluck away the Silver Knights.
Proceed onward, fighting your way through enemies where you’ll eventually reach the area where you can continue Anri’s questline. You’ll find a pilgrim, some stairs leading to a bridge and a long hallway. head up the stairs, and use the lever to activate the bridge. cross the bridge, climb the tower on the other end and hit that lever to move the bridge once more. Now, when you cross this new bridge, you’ll find yourself at the Anor Londo bonfire.
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