In your second scenario you said:
"the question is could you call R2 automatically out if he runs directly towards 2nd base(a base he is not entitled to)? Could the established baseline be only from the runner to his next base and not the previous base because of the force situation."
NO. First, McCrowder was right that a runner returning to a previous base is not out of his established baseline. AND in your scenario you have F5 throwing to F3 which removes the force. It's not a forceout UNTIL you have a tag runner/tag base. But you had neither.
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