Eyewitness - S1-E12
Continuity mistake: When the immortal who's trying to kill Tessa snipes at her in Duncan's car, his shot shatters the passenger-side window. When Duncan tails Tessa and her police escort to the safehouse, the passenger-side window is intact. (00:30:05 - 00:35:50)
Answer: Not directly. But there is a penalty involved. In Highlander 3 the fighting on holy ground resulted in the destruction of one of the weapons. In End Game several immortals are murdered whilst on holy ground but no repercussions were ever revealed, so it's possible it is specifically about the fighting. Nobody knows what happens when an immortal is killed in a duel on holy ground but it's safe to assume the penalty will be severe because all immortals respect this rule, even the most evil ones (except that one moment in Highlander 3).
lionhead