Afterwards, you'll need to return to the central area of the tomb, so jump off the upper platform anywhere you want and head back to the bottom of the tower. In the room with the activated lantern, stand on the pressure plates and then perform a series of quick jumps across the drawbridges to get to the other side before they are fully lowered.
Be cautious because in one of the last rooms you may stumble across several Skeletons. Take them down and enter the chamber with the Judicar. Talk to him, hand him the first Soul and you'll gain access to the area with the second one.