@Monarch Lol yea sort of. Lungs served as the primary source of magic. Basically if you're having difficulty breathing, it means you're failing to manage your skill (mana) poorly to the point of nonexistence, like what happened to Giryeo bcz he was a heavy smoker. Meanwhile Haseong was still in the bad shape. If he ain't care and his pushover a$$ continues, manifesting could lead to his own doom.
@Zade what I'm trying to say is, that they put way too much emphasis on the lungs. Yeah sure you need it for magic circulation. But that doesn't mean the other vital organs are worth less. It's like going "oh thank G**, he only took my heart and crushed it with his bare hands. My lungs are still in good condition"
@Monarch Oh I agree with you. Iirc s-rank hunter have a formidable physique. Perhaps it became this alien's top priority to the point that he overlooked the fact other mammals rely on vital organs besides lungs.