After winning with rock in Round 1, there's a possibility that the opponent will expect me to choose rock again and counter with paper. Alternatively, they might predict that I'll switch to paper and play scissors. Given that the opponent chose scissors in Round 1, they might be less likely to choose scissors twice in a row. Starting with a win creates psychological pressure, so my opponent may play more conservatively with rock. Paper would beat that rock choice, and I'm willing to take the calculated risk.