Turnabout

Because of a medicine Uric fed him, Isaac was void of mana. He had zero mana whatsoever, but the moment it was reintroduced to him through the mana potion, Isaac felt his body regaining its flow.

'My mana's circulating properly already? So that means I was not drained. They were blocking my mana passage or they could've just numbed my senses to make it seem like I had no mana. But, the potion reinvigorated my mana passages, I have a full tank.'

Isaac was shocked he still had mana, but it was a welcome one he would take any day.

Together with his mana, Isaac's mind worked to its absolute limits. Before he landed on the ground, he had already spread his senses at a three dimensional degree.

Battle Minded (Exclusive Passive Skill): greatly increases focus during combat

[Spatial Perception]