Dave,
Can't be a wreck - both players do not have the "right" to be in that particular spot at the same time. Since F6 is not in the act of fielding a ball(there's no play for F6 to make), it's not interference. Gonna have to call this obstruction and most likely put the runner back on second - F1 is moving to right and will have the runner as an easy putout at third.
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Steve M
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