After obtaining secret #2 (or not), as shown in the previous section, you'll enter a corridor with a combination trap involving 3 break-away tiles (48-50/51) concealing a spike pit, with a pool of lava off to one side, then a swinging blade and a rolling boulder. (Hurrah.) To get through without losing any health, and shatter all the tiles for the "After Us the Deluge" achievement/trophy, stand about one walking step back from the edge of the first cracked tile. Wait for the blade to swing toward you then, just as it starts to swing away, run across the tiles and veer past the blade into the doorway before the boulder arrives.
- OR -
Alternatively, grab the horizontal crevice above on the left.
Traverse along the crevice all the way to the right. Lara will be hanging above the right edge of the first break-away tile with spikes below. Let go to drop onto the cracked tile and immediately side flip to the right twice, shattering all 3 tiles in the process.
The boulder should then roll past without harming her.
Then you can take your time and run carefully past the blade as it swings away.
Beyond the swinging blade, there's another slope with a boulder perched at the top. Run down the slope and around the corner to the right, ignoring the small medi pack (15) on the ground for now.
Once the boulder lands you can take a standing jump or a side flip between the boulder and the corner of the doorway...
...get the medi pack...
...and jump or side flip back the same way.
The next trap involves a slope with a boulder at the top, a swinging blade ahead, and lava pits on either side and at the bottom.
To get through without any tricky timing, turn around so Lara is facing the boulder and her back is toward the slope. Step to the right so her right arm and foot are touching the wall.
Then slide backwards, holding Action to grab the end of the slope. Lara should take little or no damage from the blade as she passes it.
Hang from the end of the slope and wait for the boulder to roll down into the lava pit.
Then pull up and press Jump to backflip onto the ledge behind you. Hop down on the left and step into the doorway.
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