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			Same as you would if the interference was by a non-retired runner:
 Ball becomes dead immediately.
 Retired runner is out (of course, he was already out, but still).
 If, in your judgement, the interference prevented a double-play on R1, R1 is also out.
 If the interference did NOT prevent a double-play on R1, R1 returns to second base.
 
 5-1-1e
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