You would feel a strong imperative to flee if you wanted to live. But that's a hypothetical imperative, which is useless for morality because it's contingent on someone sharing that goal.
Right, so is morality. Just because it's not independent of humans doesn't mean it's not real - for example, human anatomy and genetics aren't independent of existing humans but are also real.
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"It is true that tribe X practices cannibalism" is worlds apart from saying "cannibalism is good regardless of your culture or beliefs". The former is a description of moral beliefs, while the latter is a moral claim.
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