PT 57.S1.Q11 (G2) - auditions on wednesday and saturday

zythus.tcs

I watched the 7Sage video for this particular game but fail to understand a particular rule.

The rule was O1-R1-R2, which made O only possible on wednesday OR thursday. However, why isn't O1-O2-R1-R2 possible, that is, having O on both wednesday and thursday before R1 and R2?

http://7sage.com/lsat_explanations/lsat-57-section-1-game-2/

johnscottwilsonsr499

O1-O2-R1-R2 is possible, but that is not the rule. The correct order (if this is the only rule) could be O1-R1-R2-O2. If you wrote down O1-O2-R1-R2, you could miss a possible correct answer.