If F2 was touching home plate (even though on the front or 1B edge) when the runner slid in, then he is not "beyond the base."
If the slide was straight and direct, then it's legal. F2 would have to pull his foot an obvious distance away from home in order for this to be called interference. However, if he DID pull away, there probably would not be contact at all. Sounds like good (and legal) base running to me.
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