And they were pooling their votes towards Mick until Natalie won the jury over at final tribal.
They could have been pooling their votes toward Marisa if they wanted to. The important detail is that they were pooling votes AWAY from Russell. Not giving him a fair chance. That is the height of immaturity (letting sour grapes determine your jury vote), and displays a rather large lack of respect for the game.
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Evacuate? In our moment of triumph? I think you overestimate their chances.