>21:30 Li Tianchen wants to take control of Cheng Xiaoshi through body contact so he attacks with open hands style, while Cheng Xiaoshi has to counterattack and avoid getting touched by Li Tianchen at the same time.
>22:35 23:45 Bad calls with the bullet?π
One thing is that the main crew have used up most of their resources for this case at this point, as Li Tianchen's family photo was used and their own phones with any possibly related photos were likely destroyed in the explosion and also taken away by Ma (the thug), so the current available resource is the photo left by Qian Jin.
However, if changing the past is even viable, I think that fixing Qian Jin's past wouldn't drastically change the Li's domestic violence case and its aftermaths, and it is possible that something could've changed along changing Qian Jin's past, but this would've also meant that the violent tendency of Li Tianchen remained and he could've caused another chain of events without crossing path with Cheng Xiaoshi and Lu Guang.
I think that if the crew managed to put off this case, something bigger than serial murders would arrive without them realizing.