It means we don't die, but we're not invincible. Like, we can't regrow limbs or anything like that.
[ And if they lost any of their major vitals, they'd be essentially a vegetable or in constant, unstoppable pain, but he didn't really want to explain that part of it. Hopefully Ochako got the point. ]
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WOW! that's amazing! you must have seen so many cool things.
what does that mean, though? "functionally immortal"
[She doesn't want to say it because that's #badluck, but what happens if he gets injured...]
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[ And if they lost any of their major vitals, they'd be essentially a vegetable or in constant, unstoppable pain, but he didn't really want to explain that part of it. Hopefully Ochako got the point. ]