What happened: After San Antonio jumped out on a 19-4 run, Oklahoma City answered by outscoring the Spurs 54-32 over the ensuing stretch, per Kirk Goldsberry from the arena. The momentum reversal left the home crowd noticeably quiet.

Why it matters: The swing speaks to whether San Antonio's young core can protect a lead against a poised Oklahoma City team in a high-leverage setting. A fast start erased this quickly puts the onus back on the Spurs to respond before the run snowballs.

What to watch: Watch whether San Antonio settles its offense to reclaim control, or Oklahoma City's surge carries through the rest of the game.