code: async def retract(self, mount: top_types.Mount, margin: float):
          
          smoothie_ax = Axis.by_mount(mount).name.upper()
          async with self._motion_lock:
              smoothie_pos = self._backend.fast_home(smoothie_ax, margin)
              self._current_position = self._deck_from_smoothie(smoothie_pos)
docs: Pull the specified mount up to its home position.
  
          Works regardless of critical point or home status.