As a college umpire, he was not outside of the basepath that he would have been called out. Furthermore, if a player without the ball (Yovani) is obstructing, it is acceptable for him to attempt to go around that player either by running or by sliding. I'll post rule chapters and interpretations if you feel the need to read them I just watched the play on MLB.tv several times and I think it could have been worse had Johnson been in the basepath. If we need to blame someone, it's Yo for taking a bad angle to the base (really, he didn't even get to the base. He crossed the line several feet before he got there.) but even that's not really his fault because Prince sort of forced him to veer in that direction. Just a bad accident.