I think there's a difference between knowing in a human sense, a 'prediction' sense, what someone will do based on your observations/information about the individual, and 'knowing' in an omniscient sense. The former could be incorrect, regardless of how sure you are, whereas the latter has no possibility of being incorrect. Without even the slightest possibility of your prediction failing, it's reached into the 'destiny' or 'fate' category - yeah, alternatives might exist, but they are predestined to not occur. Doesn't seem much different to me from a deterministic universe.
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