Free choice and time travel

Hello Rabbi Michael.
A terribly hypothetical question, although I have a feeling that it is directly related to Newcomb’s paradox and the meanings attached to it.
Suppose I travel in time to the future. There I see a certain person behaving in a certain way, and then I return to the present – before the choice. Can it now be said that he will choose freely when I know what will happen?
And I might add – what if this person is me? If I know what I will choose in the future, how will it affect me? I thank you for dedicating your time.