Question: How is the "no fighting on holy ground" rule enforced? I really can't see a guy like the Kurgan, who seems to have no sense of honor to speak of, following the rule willfully, unless there was some severe punishment for breaking the rule.
Answer: The "No Fighting on Holy Ground" is considered a sacred rule. Like being quiet in church, a funeral or any religious service. If any immortal would break this rule he was not be honorable and not subject to any of the other rules. Like fighting one on one and using hired thugs to capture an immortal holding him down to take his head.
Answer: What the punishment is isn't shown in this movie, but since even the Kurgan follows it, it must be high. In Highlander 3 we see that fighting on holy ground at least destroys the weapons they are fighting with (although only Macleod's for some reason), it's possible the ultimate penalty is given when an immortal kills another immortal on holy ground. A good guess is the penalty is death.
lionhead