"It could also be unsafe," Qian Cangyi continued after Ah-Zhong's remark.
He looked quite unwell. Although there might not be such a rule, considering that Quan Yun Apartments itself might have consciousness—a point pretty much confirmed—perhaps, the order in which actors run into danger does indeed relate to the number of people in the team.
Take, for example, the death of Mao Mi.
Let's assume we're not considering the triggering of death conditions and the specific process of dying, but merely the exposure to danger.
Then, the reason Mao Mi faced this danger was because she lived in Room 410, the only 'special' place.
Other residents on different floors didn't encounter the danger Mao Mi did. Even Turtle, A, and the three of them ended up in danger only because they left their own apartments.
It's true that the Machining Core, who also lived on the fourth floor, was killed last night, but his death was much more closely related to the Secret God.