Valley fold as far down as possible. The crease runs through the corners of the hidden flaps. Valley fold the extra triangles on the bottom half. Unfold to step 24. Inside reverse fold.
Valley fold up as far as possible.
The crease runs through the corners of the hidden gussets. The crease IS NOT halfway between the existing creases. Fold the near large triangle down. Note that a small roof-shape is visible, because Step 27 was not halfway between creases. Fold the tip back up, along the hidden crease made in Step 27.