Not sure how canon this is but I have personally decided that the reason people in alice in borderland can bleed out for 3 episodes straight, no problem but Tatta died of a broken hand might be because he gave up on living and as we now know borderland is between life and death so giving up does result in death the same way losing does. Other characters might not have fully given up on living yet (or were fighting against death out of spite) even though their wounds were more severe.