"Your defenses," said Snape, a little louder, "must therefore be as flexible and inventive as the arts you seek to undo. These pictures," he indicated a few of them as he swept past, "give a fair representation of what happens to those who suffer, for instance, the Cruciatus Curse" (he waved a hand toward a witch who was clearly shrieking in agony) "feel the Dementor's Kiss" (a wizard lying huddled and blank-eyed, slumped against a wall) "or provoke the aggression of the Inferius" (a bloody mass upon ground).