Cai Qin led Xiao Ya, Wu Tian, and others to escape, not heading to the camp but toward the Biological Research Institute. In doing so, Cai Qin had her own considerations.
The most dangerous place is often the safest, and this logic is indisputable, especially since those monsters had already shown up at their door. Perhaps the camp was already being staked out by monsters, waiting for their prey—rushing back there would be suicidal.
Secondly, Cai Qin believed that if she took her people to the Biological Research Institute, Fang Yi would also go there.
Such consideration was not due to any agreement with Fang Yi, but rather Cai Qin's intuition.
Indeed, she believed Fang Yi would be able to guess.
The rain was torrential, and it was still night. In such pitch-black conditions, everyone except Cai Qin was already panicking beyond recognition.
