Balk call in O's/Yankees game

[gotblue?]

Any word on the rationale for the balk call against the Orioles' pitcher in the 8th inning of Monday's game? Jim Palmer seemed to be adamant that he saw no balk on that play. To his credit, a half-inning later, he noted that there were numerous reasons (runners LOB, etc.) that the O's were in a precarious situation in the game. Just wondering if there was a post-game debrief that is available to the public as to what PU saw, and what rule was violated.