Victor Wembanyama's absence could have swallowed the whole game. That is usually what happens when a team loses its defining player in the playoffs: every possession becomes a referendum on what is missing.
San Antonio turned Game 3 into something more useful. The Spurs beat Portland 120-108 without Wembanyama and took a 2-1 series lead because Stephon Castle and Dylan Harper gave them real offense, not just emergency offense.
Castle's 33 points were the headline because they had to be. Without Wembanyama, the Spurs needed someone to bend the game first instead of waiting for the ball to find a safe place. Castle did that. He made the night less about surviving Wembanyama's concussion absence and more about whether San Antonio has enough creation around him to keep a series from shrinking.
Harper's 27 points and 10 rebounds mattered in the same way. One young player having a burst is a story. Two carrying enough of the load to beat a playoff opponent is a structure. It does not mean the Spurs are better without Wembanyama, and it does not make his availability a small thing. It means the floor underneath San Antonio looked sturdier than expected.
Portland had its own answer in Jrue Holiday, who scored 29 points. The Trail Blazers were not just handing the game over. That is what makes the Spurs' response more interesting: they did not need a perfect substitute for Wembanyama. They needed enough pressure from Castle and Harper to keep Portland defending the whole game.
For San Antonio, this is the useful lesson. Wembanyama is still the center of everything. But Game 3 showed the Spurs can win a playoff game in which the first option is unavailable and the next wave has to create instead of merely complement. That is a different kind of confidence.