In Youzhou:

because Yuan Shao was busy attacking Yuan Shu, his younger brother, he temporarily gave up his fight against gongsunzan of Youzhou. After gongsunzan and Liu Yu didn't get a tip off from gongsunji, they took this opportunity to use Liu Yu's intention to kill themselves as an excuse to attack each other and annex Liu Yu's forces.

Liu Yu's seamless plan was informed by gongsunji, and the two sides declared that they had failed, so they fought against each other.

Yuan Shu Department in Nanyang:

it took Yuan Shu only a few days to slowly break Zhou Zhe, who was appointed as Yu Zhou's envoy by Yuan Shao....