They harbor a deep hatred for Lin Yifan, so it's impossible for them to help him; besides, Lin Yifan was led here by them, how could they turn around and help him?
The situation gradually returns to a balance; without the fifth force joining the battle, change is unlikely, at least temporarily.
During the confrontation with various cultivators, Lin Yifan suddenly feels discomfort, his dantian swells, and there's a pressure that seems trapped inside, forcing its release.
This sensation is not new to him; each time he advances, he encounters it.
In other words, he is about to break through.
Causing something like this at a critical moment presents a significant risk.
But without advancing, his dantian faces the danger of explosion; if the dantian is lost, he would become a mortal.
Not wanting to break through during battle unless absolutely necessary, he suppresses himself.
The secret weapon is almost depleted, and the allied forces face the same situation.
