Kong knew these monsters were blood type spirit monsters. And he also knew such information wasn't widely spread among the community of strong spirit masters.
Hearing William educate his clan's future generation in such a way made his doubts ease a little bit. William was giving them a lecture that any formidable spirit master would do to these kids.
And that also shone the light over something else… From the look of it, William knew exactly what was coming at them and knew perfectly well how to stop it!
It was something even he, one of the prominent figures in the entire world of spirit masters, wouldn't dare to say he knew or could do!
And when he thought about it more, this grand spirit master knew there was something off indeed about everything.
The monsters came and attacked his clan without a reason. When he thought back to William's words, he couldn't help but shake his head in denial.