The Heat moved into a 2-1 lead over Indiana with a 99-87 victory at the American Airlines Arena, as both LeBron James and Dwyane Wade turned in match-winning performances.
"We looked like we were stuck in the mud in the first quarter," revealed Spoelstra after the game.
"That is a big credit to how they dictated the game. We can't play this series on their terms. It was good to see us bounce back in the second quarter and show some toughness."
The two sides meet for Game Four on Monday.