Pete has a good point about 3rd base-line extended. I believe on the swipe tag, the correct mechanic would be the 3rd base line extended. In this position you will be able to see if the runner is tagged on the swipe tag. When the play at the plate isn't a swipe tag, it would possibly better to go 1st base-line extended. From here you should be able to see the runner coming into the plate more clearly.
-Jeremiah
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