This person he's referring to can't feel any remorse or sadness even though he knows he's done terrible things, killed people in a battle, perhaps. He doesn't feel in touch with reality anymore after everything has happened, everything he's seen.
This person he's referring to can't feel any remorse or sadness even though he knows he's done terrible things, killed people in a battle, perhaps. He doesn't feel in touch with reality anymore after everything has happened, everything he's seen.