Ruruo was indeed able to sense three stronger aura's they clearly where above heavens mandate. She was not in a hurry to act, this was because she was curious about the reason the guys hidden in the void didn't react at all.
Casting her eyes into the void, she could see the Noudin City lord was able to fight five heaven Mandate experts alone.
From the exchanges the city lord had with the other experts, it was clear that his combat strength was not to be looked down upon. Only those hidden in the void where able to tell that the city lord was just lacking to enter the same level as them.
In the begining they where not planing to meddle, just to watch over the situation and make sure things didn't develop beyond their control, but the power showed by this man made the hesitant.
If he escaped, then it would affect them in a lot of ways, forget the suspicion of colluding with the Demon clan, the talent this city lord had was also a threat.
