Towards the end of the game I think he lost his focus because he thought the game was wrapped up, but the raptors didnt quit and Ukic made him look foolish...also if Paul Pierce is bringing up the ball and running the offense looking to iso or kick it to a shooter, there isnt any need for rondo to be in the game at that point imo, he turns into a liability..
On a side note, i loved the play at the end of regulation to rondo, too bad it didnt work, cause they probably wont use it again