Isaac no longer cared about anything. All he did was look for ways to get back to where he lived. Even if a god descended into this world, he would kill him if it meant that he could return home.
Using teleportation magic was more difficult than using the strategic magic he had used earlier. Especially if the teleportation involves two different dimensions, apart from requiring a large quantity of mana, the user must also have excellent control over the magic he uses.
Besides abundant mana and control over magic, teleportation magic users must also have a clear mind. Those three things are the foundation of teleportation magic. Isaac's mana was unlimited, and the ability to control his magic was excellent. But what he lacks is clarity in thinking.
