Irvine decided to take a moment whilst at higher ground gazing out over the maze to try and decipher where the fox was trying to lead him.  His shadow mimic, merely copied Irvine's movements this was all a deliberate ruse as the two constantly switched places to deceive their guide into not knowing which of them was the mimic and which was the real person.  They both occasionally glance at the fox to see if it has moved.