Obstruction, who's call?

I'm assuming that BU was in "A". In this you should go up the line as close to the 45 ft line and watch for lane violation, dead balls, obstruction, any else that may blow up around first. If you are slightly inside the line you should be able to see the call fairly easily. But by the same token the BU shopuld have a decent look also. Whoever sees it call it, but I say it's yours primarily. What did your partner have? It may be that you didn't see it because it didn't happen. JMO