Both are a possibility, I think. I'm not sure. The good result would be B's past is different and B becomes a different person because of it, hopefully still someone who would be Chosen. The bad result is B stops existing.
It's a real headache. If, knowing when A changes their future it may destroy everything B knows or maybe B themselves, how can A try to change anything at all, even if it's bad things they want to change?
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Both are a possibility, I think. I'm not sure. The good result would be B's past is different and B becomes a different person because of it, hopefully still someone who would be Chosen. The bad result is B stops existing.
It's a real headache. If, knowing when A changes their future it may destroy everything B knows or maybe B themselves, how can A try to change anything at all, even if it's bad things they want to change?