The creasing stake is tucked into the rounded area where the bulge and the flat plane meet.  Using a ball hammer I'm shaping the metal right behind the edge of the stake, causing the wall of the projection to become a bit more oblique to the plane joining it. With another hammer that has a flatter radius to the face I'll then hit the vertical section against the stake to accentuate the change of direction.  The junction at this point will then be sharper than it was previously. Afterwards I'll work on the bottom area to be flattened over a flat top stake from this same side of the piece.  That will even out the new work with the previous so the flat plane will be continuous right up to the point where it thrusts out of the plane.  You can't understand what I'm talking about here can you?  Neither can I so I'll show you what this means later.