The call was reversed, that was the break. If Youk ran out of the baseline to avoid the tag, then he's out.....that didn't happen. Watch the replay: when youk avoided the tag he was directly on the baseline between 2nd and 3rd (directly!) Arod then threw to first, after the ball was gone Youk's momentum carried him out of the line onto the lip of the grass. As I understand the rule to be, Youk should be safe. My assumption is that the umps were not in a good position to see what happened and one of them saw youk touch the grass so they called him out.