He started his training in this place. Although he was concerned about Kyle, Sherry, and Anya, he might need this technique in the future, making him unable to go back yet. Because he did not know how long the real world had passed and could not cultivate more than this, he could only increase his strength by learning this technique.
The training was insane that even made him forget about his matter a few times. Even after experiencing the most gruesome training, he held it to the very end. In fact, this Phitrus just wanted to bully him in the process.
And finally, after several months, he mastered his technique. Phitrus said this was a reward for him since he knew about Alex's past and how troublesome it was to accept such a thing. This way, he would not meet any resistance from him.