Only resolve half the crease. Repeat Steps 39-40 on the left. Valley fold the near layer upwards at the intersection of the new creases. Note that the creases line up. Unfold to Step 43.
Valley fold through all layers on the new crease.
Crimp the model to form the angle bisector. The left side will pull up. Unfold to Step 48. Repeat Steps 48-49 on the left. Unfold the near triangle.