From your description, it was obstruction, but the proper base award would be 2B (unless the rules you were playing under require a minimum of 1 base award for OBS). But, of course, I'm only going by your description, and the base award is umpire judgment.
The BU should have signaled OBS even if the runner did not appear to be going anywhere. That would have prevented SOME of the drama, at least.
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Tom
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