The thing is, momentum will shift even faster in favor for the home team in game 7. This is probably why game 7's in the finals are won by the home teams. Even though in 2010 Boston was up by double digits in the fourth quarter, the Lakers stormed back on sheer energy from the crowd. Everyone playing is extremely nervous and it would require cold blooded creatures to not be affected by the crowd. At any point, if anything goes wrong, the game can easily snowball out of control for the Spurs. However, even if the Heat are down 10-15 points in the fourth, they still have the opportunity to ride the wave back into the game. The Spurs have to play 48 minutes of near flawless basketball to take the game. I've seen them play a complete game before, firing on all cylinders (most notably in game 3 against the Grizzlies) but it's not something that happens very often. On the bright side, at least there is a game 7, it gives Parker and Ginobili a chance to redeem themselves. Parker messed up gunning for that finals MVP and Ginobili was too busy playing for the Heat and laying daggers in the backs of his real teammates.