This may sound bizarre, but if you want the next save/power-up crystal, it's actually much easier if you turn around and paddle through the gate backwards. (Thanks to Jsenecal for this tip.)
As you slide down the chute facing uphill, paddle forward periodically to slow your descent.
Then, when the waterfall widens, steer left and forward to fight the current...
...as you paddle over the cascade into the pool beyond.
There are several waterfalls feeding this pool. Paddle forward and around to the left...
...to reach the one with the crystal. You probably noticed it several times as you explored the various caves and ledges. Now you can finally get it.
Once you have the crystal, head back toward the cascade where you came down from the building, then around the corner to the right.
Although there is a red tripwire below, try to stay to the left as you go over the waterfall.
It's a long drop, but you can back paddle as you go so you don't land too hard. (If you go over the falls on the right, you'll land on a huge boulder and Lara will take damage.) Continue to back paddle as you cross the tripwire.
This will slow you down so you aren't crushed by falling rocks ahead. Once they've settled, continue past them.
As you move out into the slightly calmer pool ahead, steer to the left to cross the green tripwire, which deactivates the slicing blades on the right.
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