You bolt for the aisle the moment the lights reach their full brightness, not really wanting to see what happens, though what you do catch sight of is quite alarming. The changes earlier had been slower, more erotic, pleasing even. But now, under the special lighting, the transformation is violent, taking only a matter of moments. The werewolves virtually explode out of their human skins, immediately growing to hulking proportions, swarming over the unchanged volunteers, who fall to the floor, then arise anew as werewolves to join the large pack.
You somehow make it to the exit, followed closely by two of the others who didn't want to change, and you barrel out the door.