Bai Zemin's bellow was filled with fury, but mostly filled with despair.
The requirements that the Soul Record imposed on him this time to allow him to break through the barrier of the First Order and advance to the Second Order were too demanding. No, to even call them demanding was too great an understatement.
Bai Zemin could only look at those requirements with the same eyes he would look at a First Order beast while he was still just an unevolved level 0 human.
This was not about desperation due to lack of strength, not at all. Bai Zemin was very confident of himself and was sure that even if he ended up exhausted to death he definitely had the power to end the lives of 2000 Second Order enemies.
The same was true for Third Order existences; Bai Zemin was at least 70% confident that he could defeat Third Order beings within the early stages.