My thoughts after seeing the replay are, after missing the catch and laying on the ground, it looks like middlebrooks picked up his legs to try and trip craig. But, craig tripped on middlebrooks' upper part of the leg, so the raised legs had no effect on the play. I'm not sure if the umpire called the interference on the attempt at tripping, with the raising of his legs, or just the fact that craig tripped over him. If its just because of the fact that craig tripped, I have issue with that, because that means that middlebrooks' only options were to not dive to try and save the throw or to dive like he did. IMO, he has to be allowed to make a play. If its because he raised his legs, thats at least just a boneheaded play and I can't fault the umpire for making the call on that because at first I thought that might have been why he was tripped. Either way, its a crappy way to lose a game in the world series.