This can be seen as his stance on taking revenge for even the smallest grievances, yet he doesn't kill indiscriminately; in fact, he has rarely acted in so many years.
However, once provoked, there comes a day when there will be a price to pay.
As for Hu Xiao, the Dividing Spirit Realm Venerable of the Tianlan Holy Repository, the two had never encountered each other, nor had any friction.
But from the moment they both acquired pieces of the Refining Qi Pot, their fates were sealed—one of them was destined to fall.
That is the way of the Cultivation World.
So Su Yu took the initiative to lure Gongsun Hongxian over, and after Hu Xiao made his move against Gongsun Hongxian, he ended Hu Xiao, the Dividing Spirit Realm Venerable, and seized the fragment.
He obtained the treasure and extricated himself from the situation.
As for what would become of the Gongsun Family and the Tianlan Holy Repository? That was not within his consideration.