Sounds like textbook obstruction to me. You have a fielder who impeded a runner while not fielding a batted ball nor in possession of the ball. Don't think HTBT, and don't care if F4 had a chance to avoid the runner. This is obstruction; the fielder simply cannot impede the runner.
The ONLY possibility that this might not be obstruction is if you judge the runner changed his basepath for the sole purpose of making contact with the fielder.
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