Let me try to describe what I'm seeing in my head a little better. Imagine A1 on offense standing on the low block and facing directly toward the nearer sideline. Now picture B1 on defense facing A1 from the side, with B1's back parallel to the nearer endline. A1 and B1 are perpendicular to each other, if that makes sense. If B1 were to put both arms straight out in front of him, one arm would go directly in front of A1 and the other arm would go directly behind A1.
Positioned this way, if B1 puts an arm up in front of A1, he has pretty good defense against the entry pass. If A1 then knocks down B1's arm, that would be a "swim stroke".
I hope that helps a little. Maybe somebody else can describe it better.
Chuck
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