The snout. The wolf's head.

Bone remodelling takes days to weeks. The shift lasts hours. The skeleton does not change. The shifted Lycian has a human skull whose contents are under considerable hydraulic pressure and whose craniofacial ligamentous attachments have been temporarily enzymatically loosened. Engorged pterygoids and masseters splay the zygomatic arches. The mandible displaces. Temporomandibular viscoelasticity drops, so gape increases. Temporalis, grossly swollen, pushes the thin temporal bone and supraorbital rim into a heavier brow.

These changes are real, visible, and reversible because they are enzymatic and hydraulic, not osseous. There is no wolf skull inside the myth. There is a human face being used as a pressure vessel. The snarl is architecture under load.