I can't remember who it was this morning on the radio that said it but they said the Heat were going for the kill shot instead of playing solid ball and it caught up to them.
Of course the Heat melted down - here's a newsflash - you can't lose a 15 point lead unless you make some mistakes.
At the same time, there are plenty of cases where teams had 15 point leads, played like crap trying to drain the clock and the other team still couldn't come back - or even get close.
So yeah, the Heat played poorly - you'll never see a team blow a double digit lead that late without playing poorly - but the Mavs took every ounce of what was made available to them. If you gave a guy an inch, he was hitting the shot - if you were out of place, you were getting burned - and in the end, they pulled it out.
Like some others have said - the Mavs haven't played a good game yet. Sure, alot of it is due to Miami's defense - but if the Mavs get on track back in Dallas, this thing could be over for the heat - quick.