so in this life he finally got the chance to learn martial arts. hopefully he can save the old man, having a doctor is a must, and his body may get better if he evolves, the issue is that he can evolve even while hurt.
in his last life he probably never got a chance like this. like he said people didn't trust each other at all, why would they share it with him? now he can offer something, i am sure he can get close to the old man if MC can protect the girl.
safe keeping knowledge is always a common occurrence, that is probably why humans failed every time, but it goes in line with the idea about protecting their legacy so commonly known.