In ASA, the difference here is that the physical assist by the coach is not technically interference. The runner is out, but, just as if a runner passed another runner, the ball is still in play. So, as you said, you call the runner out and let the play proceed. After the play, you make whatever obstruction awards are in order.
The CO vs later INT play is difficult because two rules are apparently in conflict. One rule says the runner is out for interference, the other says the coach has his choice to take the play or the CO.
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greymule
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