Delirium
A supernatural fear of shapeshifters instilled in Humanity by the Garou. Upon witnessing a Garou enter their War Form, they are subject to a willpower-based response ranging from fleeing in terror to charging the beast with reckless abandon.
Humans never see Crinos-form Garou for what they really are. They always rationalize them instinctively, concocting elaborate and horrific stories about what they saw. That is, if they even remember it at all.
For the mechanical explanation, see Delirium.