Disagree
I disagree with holding the arm out until the play stops. If you do so, you are still indicating the obstruction is protecting the runner. You can't determing after the play if you uphold the obstruction or not. This is really, really, placing the runner in jeopardy. If they think they are protected, they're gonna run. If they don't see the arm up, they realize the obstruction is no longer protecting them and they are advancing at their own risk. They can't read your mind, you have to give a signal. They especially can't read your mind, if you don't make the decision until the play is over with.
Rick
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