The force of explosions spread far and wide, covering the Cang Lan sect's inner court. With the missing barriers, there was nothing to stop the shock wave from proceeding and knocking down the remaining buildings.
As for the people who were caught in this shock wave?
A majority managed to survive simply due to the fact that the sect had already triggered a state of emergency and they had all retreated.
After all, the true emergency started right from the moment the outer court barrier of the sect had fallen. That and the six large bone pillars were had also killed quite a few people around where they had appeared.
This too contributed to many people escaping the sect. Though there were still a significant number of disciples that had yet to leave the sect. This was simply due to the fact that it would be against the rules to leave the sect when it was under distress.