How to make an eight-pointed origami ninja star

(page 9)

15.

Pull two opposite-sided crease lines in the opposite directions.

Prepare to rotate the model by 45 degrees in the counter-clockwise direction.

16.

Do the followings:

(a) Carefully and slightly pull two opposite-sided crease lines in the opposite directions.

(b) Rotate the model by 45 degrees in the counter-clockwise direction.

Do as many as of (a) and (b) to flatten the top.