Ah, yes. Montroll's signature "open the head" command. One of my favourite origami artists ever--but this step had me quizzed too.
I apologize for the bad quality photos. Note the MANY layers in this fold. Be sure to make sure no white layers are showing. I drew a few pictures too just to clarify the blurry camera pictures. They only show opening the head. All that is left from these photos on is to flatten the head down further.
If these don't quite help I can try to make it systematic.