I'm choosing scissors for this round because the opponent may try to play paper to counter my recent rock choices. Their previous moves (paper, rock, scissors) don't show a consistent pattern yet, but they might return to paper thinking I'll stick with rock since it's been working for me. Additionally, scissors hasn't been played since round 1, making it less expected. While this is risky if they choose rock, I believe they're more likely to choose paper for this round.