ggk,
Under OBR and NCAA, if, in the judgment of the umpire, the F3 had a legitimate chance to obtain an out absent the interference, the BR is called out for interference, the ball is dead, any other runners return to their TOP base. If the F3 did NOT have a legitimate chance at an out, it is Obstruction (Type A), the ball is dead the BR awarded 1B and any other runners awarded the base they would have achieved absent the Obstruction.
Under FED, assuming no intent by either (& the runner could not have reasonably avoided the contact), it's a "train wreck", live ball, play the bounce.
JM
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