They chose to enter Li Lanfeng's domain because they thought that the four of them together would finish off Li Lanfeng quickly in his domain, which in turn would give them more time to prepare for Ling Lan's arrival. They were basically underestimating Li Lanfeng. However, now, it seemed like their decision to enter Li Lanfeng's domain was a mistake. They should have destroyed Li Lanfeng's domain and then dragged him into their own domains.
The four of them signalled at each other with their forefingers, and all of their domains were activated simultaneously. They had been in the same team since they were young and they had basically never worked apart from each other, so obviously, they would have seamless teamwork.
Soon, an amalgamation of domains were formed as they connected into a line and went against Li Lanfeng's domain.
