The Challenge: Avoid taking damage from the bone saws is pretty straightforward. If you touch any of the saws as you make your way across the round platforms, you fail, but there are a few tricks that can help. Here's the sequence:

Hop onto the nearest round platform as the bone saw moves away from you.

Follow it around the platform clockwise and shoot the archer that appears on the square platform to the right.

Continue moving clockwise around the platform to keep ahead of the saw...

...and jump onto the next round platform to the upper left.

The saw here moves counterclockwise, so follow it around to the right as you shoot another archer on the platform ahead.

Continue following the saw around the platform until you are able to jump onto the platform to the right with the 2 bone saws moving counterclockwise. Here you'll need to be especially careful to land between the two saws and keep moving so they don't touch you.

Circle around to the upper right side of the platform and then jump onto the next one, which has a single saw moving clockwise.

Keep moving to avoid the saw as you shoot another archer that materializes on the platform to the upper right.

Once you've taken care of him, you can jump across to the final platform, again avoiding the 2 counterclockwise-moving bone saws.

Before jumping over to the broad ledge ahead, you may want to pause and check the Challenges screen to make sure that you haven't taken damage. If you see a red 'X' under this challenge, meaning you took a hit, you can reload the previous checkpoint and try again.

When you jump onto the broad ledge, a new checkpoint registers. So if you failed the challenge you'll have to try again in a different playthrough.

NOTE: This is not the only area with bone saws, so you won't receive any reward yet.

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