He was already abusing his [Foresight] skill and forcefully increasing its range was the last push it needed. Neither his brain nor his eyes were able to handle that much stress and to prevent his head from exploding under pressure the skill shut itself down automatically.
This was a safety measure all of the high-level skills have in them, but here it rather did the opposite. The effects started to kick in.
Just like when Zero had deactivated his skill after using it continuously for thirty minutes for the first time, he started to slowly lose consciousness.
The view before his eyes danced and ran in every other direction. He fell to the ground, with many a demon beasts around him, all of them ready to attack.
One of them stood on two feet and raised its bulky arms up in the air and targeted Zero down on the ground; it was planning on smacking Zero to death and making him a pulp of flesh and meat and blood.