After burying Reggie, the group continues. During the journey, Duncan and Methos conclude the expression "there can be only one" does not refer to one person becoming the last immortal and claiming the Prize, the power of all immortals who ever lived.
After Reggie's burial, the group continues on its journey. As they travel together, Duncan and Methos clarify that the phrase "there can be only one" does not imply a single individual emerging as the last immortal to claim the Prize, but rather represents the collective power of all immortals who have ever lived.