Did I overthink this?

[snrmike]

The fielder has to at least make an ATTEMPT for me to call interference. However the BR doesn't have running restrictions until they get at least halfway up the first-base line.

If the BR was only a few feet up the line, it's pretty hard to be in foul territory that close to the batter's box. On the other hand, if the BR was already 45 feet up the line and they were still clearly in foul territory that would make that BR elegible for an interference call. You pretty much have to view these calls on a play-by-play basis.

I saw that play, the pitcher double-clutched and then launched it. I thought it was a decent call, but then I've seen worse ignored.