Highlander S04E14 - Deliverance (2)

Still under the influence of the Dark Quickening, MacLeod arrives in France and starts sowing havoc, leaving a trail of hate and destruction in his wake. In a flashback to 1917 France, Duncan is an ambulance driver, and his Immortal friend, Sean Burns, psychoanalyzes the battle-fatigue victims, discussing his calling with MacLeod. Meanwhile, both Methos and Sean Burns try to reach MacLeod. Methos despairs that he might have to fight his friend if he cannot reach him, but with Burns' unexpected influence, he has someone who might be able to break through. Methos finds MacLeod and discovers just how evil he has become when he tries to take Methos' head on holy ground. After MacLeod kills his good friend Sean, Methos realizes that the only way to save MacLeod may be to kill him.