Time to time He looked back while running, while activating primal eyes.
His primal eyes aren't normal vision like what he sees through eyes normally every other time nor spiritual sight that depends on range of spiritual sense while spiritual sense being active.
Primal eyes shows world differently, it shows energy waves, signatures of any living, non-living solid matter, non-solid matter.
Also Similar to spiritual sight it shows through any solid, liquid, gas matter depending on grade of the matter. Living or non-living.
But its range depends on basically how much blood energy or blood force he uses to use the primal eyes.
More blood force is used for activating primal eyes, further his vision will reach.
Using primal eyes until now he have know these aspects, just like he activated them moments ago while looking back.
Distance is quite far so consumption is also more which showed both soul creatures have reached previous spot of first soul creature.
