code: def _move_defensive(self, agent_pos):
      best_dist = 0
      best_pos = self.pos
      best_action = -1
      for a in ACTIONS:
          next_pos = self.env.next_pos(self.pos, a)
          # not movable in this action
          if next_pos == self.pos:
              continue
          dist = manhattan_distance(next_pos, agent_pos)
          if dist >= best_dist:
              best_pos = next_pos
              best_dist = dist
              best_action = a
      self.update(best_pos, best_action)
  
imports: import logging
  from typing import NamedTuple
  import numpy
  from gym import Env
  from gym.spaces import Box, Discrete
label_desc: Use image node_id 5 for calling the Ghost obj's underlying member method code with example usage: obj._move_defensive(agent_pos) without return types