Alex started cultivating. Unknown to him, people from many forces were on their way to him. Even if he wanted to hurry, he can't. The golden lightning made him can't do so. The only way to escape was to advance first as quickly as possible then finally escaped.
Leoz and the others were killing the monsters without leaving an opportunity for the monsters passed through them and made their way to Alex. They thought the monster might not have any leader, the way Anna had speculated.
They were attracted to Alex's Lightning Tribulation. That was their instinct as a Monster Beast. With that, Anna did not have anything to bother her for a while and continued killing the monsters. Her killing rate also increased. Of course, it did not mind that she let her guard down.