Direct question: I agree with Mike - if the umpire did not see it, then he can't call it. Play happens just as if the players did not collide (since "officially" they didn't).
Indirect question: What if the umpire had seen it?
Well, you can't call obstruction on the offense, so unless the retired runner assisted the runner or got in the way of the defensive play, you've got nothing.
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Tom
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