Yanael's so-called training was barbaric, unstructured, spartan, brutal, painful, and torturous.
…But it wasn't all bad. It helped Zach get his head on straight when he was in horrible conditions. He could defend and cast barriers even when he didn't know the difference between up and down. He learned how to take blows that would have otherwise rendered him a trembling, unmoving mess.
He learned how to cast specific barriers that only took up as much space as they needed to block a particular attack. Then, he learned how to take them down before they broke to the attack.
Zach got significantly faster at casting and tearing down his barriers. He also got faster at running since that was the only way he could delay getting hit by Yanael, even if only by a second or two.