Haotian Saint Supreme was not joking; this warning was a real warning, a blatant threat.
As the Haotian Saint Supreme, he had never felt remorse for anything in his life, but this time he did. An old friend got into trouble while he was in seclusion, and he felt deeply guilty for not being there.
His mood was already bad, and upon exiting seclusion, the things he heard from his subordinates enraged him, especially the Demon Race's attitude back then, which infuriated him even more.
Yumo's appearance, without an immediate attack, was considered reasonable. Had it been someone else, they would have long lost their head.
"Haotian Saint Supreme, I admit you are strong, but I, Yumo, am not weak either. Today I come only to mourn my Demon Race's descendants. If not, I don't mind having a little skirmish with you." Yumo was equally unyielding. As the current Demon Race Chief, how could he be intimidated by just a few words?
Absolutely impossible, otherwise, where would his dignity be?