A few of us had this discussion at the NCAA meetings in January. A person 'leaping to contain a thrown ball' is not occupying a position. He abandoned his position when he took to the air to catch an errant throw.
In the OP, the defensive miscue caused the fielder to end up on top of the runner. Penalizing those at fault would be the consideration. While this is HTBT, the description shows the runner sliding INTO the base when the fielder collides with him.
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