Full Moon have reputations for high drama. One moment we are on a quiet, late afternoon hike through the park and the next we are howling at the night sky, biceps ripping out of our shirts, running naked through the trees. We don't notice the branches cutting into our feet, the cold winds whipping our ears or the icicles beginning to dangle precariously from our private parts.
The high drama at the Full Moon is about our awakening to something that has been building to a point where we finally notice it. Full moons bring in lots of light, after all, and the werewolves, like us, had lots of little clues, ie wolf bite, growing hairy fingers and pointy canines - that something was amiss long before the full moon beckoned them (and us) into the woods.