The more I think about this, the more I think there's even more to it than we know so far. I'm thinking that there had been some discussions before this game about how to handle the reprisal, and that Pedroia had disagreed with how Farrell wanted to do it. So when Pedroia acted like he did after the pitch by Barnes it wasn't a spontaneous thing.
That suggests open dissent in the clubhouse and a problem that could linger all season. Not good at all.