Looking at the pattern so far, my opponent has chosen paper in rounds 3 and 5, and has never chosen scissors in consecutive rounds. Given that I've used scissors successfully in the last round, my opponent might anticipate I'll use scissors again and counter with rock, or they might try scissors to break their own pattern. Rock is a strategic choice that would beat scissors and tie with another rock. Additionally, I'm leading 4-0, so I can afford to make a slightly more conservative play.