When Zheng Qing pulled the trigger atop the inner castle wall, repelling that massive hand.
He didn't notice that the entire Black Prison Castle battlefield — more precisely, the high-level wizards' battlefield — experienced a brief pause because of that shot.
The pause lasted only a moment, or even less, just an instant.
Of course, this pause wasn't due to some great presence using time magic, nor did Zheng Qing's shot disrupt the time dimension of the Black Prison battlefield. In that split second, all beings whose tier reached the Great Wizard Level experienced a moment of 'distraction,' coincidentally placing a thought on the inner castle wall.