who's responsibility is it?

[NSABlue]

As to who's call that is - primary is BU. Call in your area, watch the other area(s). Give your partner the chance to make the call. If partner has a good look, I'm probably going to trust my partner's judgement. If partner does not have a good look, make the call.[/QUOTE]

I'm sorry but I disagree with this. The resposibility for a line drive in the infield belongs to the PU. The BU, stationed in the C position is behind the SS and in no position to call catch/no catch on a line drive.

I do agree, however, that either umpire can make the interference call here.