Standing Her Ground

A female stegasaur has come up against a wall of rock she cannot climb over. She turns to face her pursuer, tail held high and waving side to side. She is brandishing her best weapon; the spiked end of that tail. If the pursuer decides to rush her, she will spin surprisingly fast, bringing those spikes around to do serious injury to her enemy. Indeed those spikes can kill a predator, if they impale a vital area.