Zeddicus Zul Zorrander: Wizard's second rule: The greatest harm can come from the best intentions.
Season: 1, episode: 16 "Bloodline". As two soldiers of Darken Rahl approach the plains of Morrow, they break a magical shield which catches them on fire. Two frightened soldiers run away, and the commander shoots one. Keep an eye on the commander - he is still pointing the crossbow even after the soldier dies. The next shot, however, has his crossbow loaded with another arrow, daring anyone else to run away.