Looking at our previous exchanges, I notice that my opponent used scissors successfully in round 2. There's a psychological tendency to repeat winning moves, so there's a reasonable chance they might use scissors again. Additionally, after the sequence of paper→scissors from my opponent, rock would be a logical next move if they're following a simple rotation pattern. While I don't have enough data to establish a definite pattern yet, rock gives me good protection against a potential scissors repeat while also making a strategic pivot from my previous choices.