Head for the corridor right from the fountain. Be vigilant since you will come across quite new pitfalls. Run through the corridor without stopping because there are openings which large spikes located in the floor which pull out every second.
Pass two bends to the left, and you will see the half of the turning around disc, looking like huge lumber frame saw. It hides and comes out in the floor alternately. Sense the moment when it vanishes from the field of view and run above it.
There is next deathly "novelty" a bit further on. The passage is blocked by horizontally lying revolving chunk with one smooth half and other spiky. Wait until the roller will turn around with safe side and run above it. Run on the close by wall behind it, catching the rail. Take it with the pounce.
There is a short section of the safe way in front of you, after which the abyss will stop you. Move over right under wall and prepare for the sprint. You have to pay attention to the obstacle which is saw coming out from the wall. Run horizontally over the wall when the saw is hidden. A few meters behind it take off hard, fly through the corridor and reach the ledge on the opposite side.
You encounter the next cavity and the trap similar to previous. This time there is scaring, vertically moving chunk stuffed with spikes instead of saw. Do as prior - run horizontally over the wall sensing the moment when the chunk turns around with the smooth surface outside. After avoiding the pitfall take off from the springboard and reach the ledge to the left.
The next configuration of pitfalls is the lane of the floor with coming out splinters and revolving, arranged horizontally chunk with spikes. Stand before the riddled piece of the floor, begin to watch the chunk. Spot the moment when it will begin to turn around from spiky to smooth side and with lightening speed run to it. Flash by above it, run vertically over the wall underpinning it and catch up its of brink. Pull up.
You can see lighted up with clear glitter end of the corridor in front of you in the distance. Before you will reach it first you have to avoid two saws, composed one after the other. They aren't difficult since they have the shifted moment of revolution. Approach some of walls and steal by through the dangerous zone in the moment when the headroom appears in lethal discs.
Run to the end of the corridor. The revolving mechanism is standing on the center. Grasp the lever and move it, and the cover will open in the ceiling. The rectangular board with the groove is located on the right wall, behind you. Run to it and stick the dagger in at its top. During the fall notice that the rocky block is pulling out from the wall behind your back. Jump on it and with lightening speed run vertically over the wall which it is sticking out of. Catch up the brink of the opening in the ceiling, pull yourself up. You have to execute the whole action with lightening speed, since rocky block is moving back slowly although deadlily to the wall.
Enter the hall through the recess in the ceiling. Localize the fountain on one of walls. Drink for health!