Zhou Tian didn't need to directly scare all the plants away, because he knew such a thing was impossible. At the time, he hoped to use the flames to cause damage to the plants, making them a bit more cautious when dealing with him, which would increase his chances of escaping this dangerous situation.
Thus, according to the circumstances, Zhou Tian either had to give up, and since he chose not to give up, despite knowing the risks involved in his actions, he decided to go ahead with them.
As a result, even though everything was just Zhou Tian's private speculation at the time, escaping was not easy under normal circumstances. But once he had that thought in his mind, Zhou Tian still resolutely made the decision to act at that moment.
