Sorry, the previous comic was building up to the gag in panel 2! Which is also a meta-joke because... well... minifig hands and all that. Ok, one of them could turn their hand sideways for "scissors" (although really it's not quite scissors, because they have no fingers), but they both know that tactically that would be stupid, because neither of them can do "paper". Therefore, their best strategy is always to do "rock" (which beats scissors) because they can draw or win, whereas with "scissors" they can only draw or lose, but never win.

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