nurse blocking / lander are formed from survivor rise over space
dead_space is observation_limiting_terrain. delay_position is cover_providing_terrain. defilade_fighting_position is observation_limiting_terrain. blocking_position is mobility_limiting_terrain. delay_position is not mobility_limiting_terrain. delay_position is mobility_limiting_terrain. spar is pole. dead_space is not observation_limiting_terrain. buckler is shield.