11 points in the opening quarter is inexcusable, period. With just a better first quarter, possibly only down by 2, maybe 3, this game doesn't look nearly as ugly, and instead of having to do so much just to catch-up to the heat, the strong second quarter would have given us a really nice lead heading into the half time, instead of merely just a tie.
The first quarter lost this game for the Celtics. The first quarter is what beat us. It gave the Heat all sorts of confidence, and it made the Celtics' margin for error that much smaller.