What a risky experience!
In order to trap the demon general, Zhang Tie actually had been wandering near the core area of the demon corps for about one month. During the past one month, he had been waiting for the very chance patiently. There were two times when Zhang Tie almost wanted to attack by force so as to attract the attention of the demon general. However, given that the demon general was very cunning and might not be trapped if he did that too excessively, Zhang Tie didn't do that.
When Zhang Tie returned to Waii Sub-continent, this sub-continent had already become his hunting ground. As a qualified hunter, besides hunting beasts, he should also be patient enough for the optimal chance to launch an attack.
Here it came.