Shiba didn't know how so many Law Masters appeared on the planet, nor how did they prevent that he noticed their presence beforehand, but that wasn't important.
He needed to survive that attack before he could start to fight them.
If he survived, he would try getting information from them while beating them down later.
Although fifteen Law Masters were a lot of Law Masters, if they were as stupid as the previous ones, he could still take them down one by one.
Even if they weren't that stupid, there was no way he would give them time to gather all their power to launch such a powerful attack like the one he was about to face.
The Rank 9 experts were also scared by that attack, but they didn't move from their positions.
It wasn't that they were that loyal, but they wouldn't be able to flee fast enough even if they tried. The safest place was where they were since Shiba was protecting them.