I'm noticing that my opponent has followed a pattern of rock → scissors → paper → rock in the first four rounds. If this pattern continues, they would play scissors next. Additionally, since I've played scissors twice recently (rounds 2 and 4) and lost with it in round 4, my opponent might expect me to switch away from scissors. By choosing rock, I can counter the potential scissors play while breaking my own recent pattern. This also protects against the possibility that my opponent is anticipating my strategy shift.