Yan Yu had beheaded Suo Wen, and the news first reached the Privy Council of Lu Country, then was broadcast internationally at a press conference before finally arriving at the Southern Border.
It's said that the Witch King, upon receiving the news, was in the middle of throwing a tantrum at a meeting: because a group of people, presumably finding Lu Country hard to deal with, had deserted halfway to attack Tianzhu to the west.
The Witch King was furious about this, saying, "I'm not saying no one should attack the west, but right now we should all be uniting and pressing north together. What does it mean to change course at this time? Isn't that a slap in my face?"
Soon enough, there were plants in the audience saying, "This is a betrayal of the Sorcerer Alliance Army," "If you know anyone, call them back immediately," and "Those who return will not be held accountable."
The Sorcerer Lords looked at each other, not particularly surprised by this outcome.