if (!random_near_space(monster->x, monster->y, nx, ny,
            false, false))
        return (false);

    {
        unwind_var<env_show_grid> visible_grid( env.show );
        losight(env.show, grd, monster->x, monster->y, true);
    
        if (!random_near_space(monster->x, monster->y, nx, ny,
                               false, true))
            return (false);
    }

}                               // end monster_blink()

}