Ethan, I think the basic problem is that the output of Threshold is always element -centric. You can select points in Threshold, but those points will define cells and only the points in the defined cells are in the output. So once your output doesn't include all the points in your single cell, then the cell isn't included in the output and therefore there are no points in the output.
A possible workaround is to use Find Data and select points - use a query equivalent to your threshold value and you should get the points that satisfy it. Hope this helps. Dennis
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