The Old Man's Condition

Alex looked at the stark white scar of the badly healed wound on the old man's chest that barely poked through his clothing. He could make out a bit of it, and that alone confused Alex quite a bit.

A Scar on an Immortal's body could only be because of one of two things. 

First, the cultivator simply didn't have any Qi to heal their wounds. 

Second, the wound was made by something or someone so strong that it didn't heal right.

As far as Alex knew, there was no other way such a thing could happen.

Well, there was actually one other way. It was whatever Grimsight had done to get himself a body that wouldn't heal properly. But that wasn't something Alex could guess here. 

Alex had asked Silvermist about the one-eyed old man and had been told in return that there was no way to heal the old man, and Alex didn't have to worry as he wouldn't come across such an issue in his life.