Content? No, but I don't think they're hanging their heads. Miami was always going to come out with as much energy as possible in Game 2. Let 'em wear themselves down and hit back in games 3 and 4 with the short turnarounds.
I don't mean to suggest that the Spurs never intended to play to win, just that they understood the big picture. We never had a chance in Game 2, so might as well come away rested rather than banged up fighting for a win that isn't going to come.