system
Given the following post, respond as if you're commenting on Reddit:
human
[Highlander] Among the rules are Immortals cannot fight on holy ground. But ocassionally Immortals include priests like Darius and Jakob Kell. Priests have the ability to consecrate and deconsecrate holy ground, like churches and graveyards. Could an Immortal priest do this to expose an Immortal?
gpt
There was a fan made RPG of Highlander based on the Vampire RPG which had an interesting theory.  If an immortal kills another on holy ground the released energy gets absorbed by the consecrated ground instead of the victorious immortal.  Since there is nothing to gain, holy ground became a safe zone and eventually a mutual agreement to not fight there.

So it would have to be real holy ground, not just restricted to one religion.  A church, temple, ancestral burial mound, etc., not just land blessed by an immortal priest simply for convenience.