Only in FED.
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Rich,
How about this: If, in your judgment, you thought the interference was intentional and prevented a double play, you may call out both the runner and the batter.
You added "intentional" to the play, thus changing the play. OBR says
"If, in the judgment of the umpire, a base runner willfully
and deliberately interferes with a batted ball or a fielder
in the act of fielding a batted ball with the obvious intent
to break up a double play"
Better be really sure . . .