I'm at the part in the Twilight Cathedral where I rode down the elevator, Got to were I raise the rock bridge and turn left to a crystal wall but there is no bomb or lit torches near it. In guides i get to the point that says "Use the handholds to traverse the pit, then jump down and activate a switch to raise a rock bridge. Blow up the bomb on the crystal and enter the room" but there is no bomb there. How do i get past that point?