Who fell asleep in the rain? Did you fall asleep in the rain? Yes you did. Oh yes you did.
If I recal correctly that is because the enemy unit cannot move onto that adjacent hex.
Thanks for your help, Anton. That is correct. In this example, the human player is playing Crimea which cannot travel onto the lake and its riverwalk allows it to travel across rivers to/from farms and tundra. Since the human character or mech cannot move to the spaces you mentioned (4 (w/a mech) and a 2 (w/a lake)) are not in the neighborhood of the human character or mech.