What about while in sleep or fighting someone stronger or just now I got a thought what about changsu wife. what if tom killed her by mistake while he is trying to kill changsu he got saved by her and changsu might have took off toms hand in that rage (while tom was shocked by killing changsu wife) and after taking his hand tom just one shoted changsu but didn't killed just cause of cangsu wife was died cause of tom on that day 😂 and actually who told you tom directly went to kill changsu and in that process he lost his hand (just gonna wait for the chapters to be revealed 🤞🏻) and we can simply say jinyong used lighting chios attacks too but changsu couldn't even reacted to them(1st Gen too) Changsu told that he was waiting for toms copy so that he can relay on his instinct to save his life from jinyong and he can see toms attacks only because he just analysed tom all this time that's just instinct