Previously, the Divine Punishment System also inexplicably granted him skills in martial arts, and even raised him to master level in one go; he did not have any say in the matter.
With a philosophy of not contending with the world, Ren He had always felt that master-level fighting skills were unnecessary, but after experiencing so many things, he now thought they were absolutely essential.
If not for the master-level fighting skills, he likely would have been subdued during the fight with Lin Hao.
At Lin Hao's level, Emetic Water was virtually ineffective; the man could fight while vomiting—how scary is that?
Moreover, without master-level fighting skills, to be honest, he wouldn't have been confident in rescuing Yang Xi and Yang En, nor would he have had as much courage to resist during the attack in the Capital.