The Jade Pool Meeting was originally a bustling place, and there were many people everywhere. When Qin Mu blew Celestial Venerable Huo away, it created quite the commotion. More and more people came pouring over.
Half-gods could easily blow Celestial Venerable Huo away, but it was definitely impossible for divine arts practitioners to do so.
Celestial Venerable Huo was the founder of the divine treasures cultivation system, and he was the one who had opened the Celestial Being Divine Treasure. He had received the blessing of ancient gods and had very strong cultivation. The only ones who could be on par with him were the other six celestial venerables.
Furthermore, Celestial Venerable Huo's abilities weren't the weakest among the Seven Celestial Venerables.