The Batman of the Sin Group wants to destroy the first earth in the parallel universe, so that all the earths originating from it will be destroyed. It is ruthless. After both sides of the fight know that even the villain will help the Justice League, they do not want to die themselves. The Flash volunteered to open the channel, and Batman said he was too slow. The villain Flash also wanted to go, so let him go, and then he kept running and finally died of old age. Batman actually knew that he didn't want to let the Flash of the Justice League die. The Batman of the sin group wanted to destroy the root cause of chaos, and was finally sent by the good Batman to the frozen earth to explode, and he could have pressed the stop button. It seems that the sinful Batman really wants to die. The rest of the criminal group were also arrested.
View more about
Justice League: Crisis on Two Earths reviews