To get to them, pull the rope between the objects shown in the screenshot and slide down.
Run over it towards the tower with the third trebuchet.
Atop the tower, there is a small wooden container.
Use rope arrow to tie it to the balance beam right next to you.
Shoot the arrow at the tip of the balance beam.
Now, walk over into the position, where you might see the bucket well.
Shoot at it to make it change positions (the above screenshot).
This way you will lock the valve and the bucket can now hold water from the waterfall.
Now, jump onto the base of the balance beam and jump down onto the metal container.
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