It was fear. Fear that, after all the years of protecting his health, his heart, his mind, setting bedtimes and boundaries, giving warnings about strangers and looking both ways before crossing the street, it wouldn't be enough. Fear that, as he stood on the threshold of adulthood, forces beyond their control would take him down a path where they could no longer reach him. Fear that he'd be seduced by something ugly and would choose it. And that there would be nothing they could do but let him go.