code: def _relative_score(self, start_eot, end_eot, active, passive):
          
          active_start = self._score_eot_for_actor(start_eot, active)
          passive_start = self._score_eot_for_actor(start_eot, passive)
          active_end = self._score_eot_for_actor(end_eot, active)
          passive_end = self._score_eot_for_actor(end_eot, passive)
          return (active_end - passive_end) - (active_start - passive_start)
docs: Return the balance of perception between the two nodes.
          A positive score indicates the result is relatively better for active.