Despite what I said not being the correct phrasing, the phrasing as it is still doesn't work. The current phrasing is contradictory. Paraphrasing the current bolded part, Ham is saying, if the Mistborn that comes against Vin has atium, she won't die - this is not correct.
Hopefully I'm making some sort of sense with what I'm trying to say here lol.
EDIT: Just saw the other responses. Thanks for those. The problem is me. I tend to have a critical, editorial eye even when just reading casually and I found the phrasing here - in character or not - to be personally quite jarring.
Thanks for the follow-ups and explanations, I appreciate it!
Also, as an avid fantasy reader for a very long time, I can't believe I never came across this series before. Love it!