You know Rondo pushed the ball up the 1st half but stopped doing it the 2nd. Seems to me that you keep doing what worked in the 1st half. Tired should not happen when you get this far in the playoffs ! It's now a 3 game series and they need to dig down deep and put these guys away ! They let game 2 get away and they should be up 3-1 !
I think the thing you are missing here though is that we pushed because we got stops. We didn't in the second half, so we weren't in transition.
To me, it was mostly that our offense wasn't aggressive. Where Rondo was driving and making plays and people were cutting off the ball in the 1st half, in the 2nd there was a lot of pass off to Pierce, KG, etc and everyone stands around. That combined with defense that wasn't as strong led to the drop off. Heat did play a lot better D too though and that let them get in transition.
Foul trouble also didn't help and I believe all of Rondo's fouls were on offense, so he had to back off there.
Every time this team plays well in the 1st half though I worry. I don't think we've ever played a complete game that way. I know that happens a lot in the NBA recently it seems but we are extremely guilty of it.