Just shoot them as they climb up to get you from the side facing the mansion. This is the best place to take out all of the enemies here. After silent grabbing a gun from the enemy nearest its archway, climb up to its second floor from the outer wall on its left side facing the well. On your first encounter with enemies after climbing out of the well, go for the ruined stone building to your right.After the cutscene, leave the room to trigger another cutscene that will end the chapter. Climb into the newly-opened passage to trigger a cut scene.See picture below for further clarification. Place the four tiles in the following locations: Eagle at C5, Horse at A4, Lion at B2, and the Animal on all Fours at D3. Use the Left Analog Stick to move the tiles, and the Right Analog Stick to switch to a different tile. Think of the 25 tiles as a grid where the columns are labeled A-E going to the right, and the rows are labeled 1-5 going down.
You need to surround the animal shown in front of you with those three or four symbols. Depending on which was you stand (in front of the tile, behind the tile, or to the right or left), four different symbols will appear. You can figure this out by looking at your journal (it should be the second to last page), and examining the black tiles by the four niches, each carved with a seperate symbol.