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Liquify is another tool that brings out controversy but it is just a tool. The user decides how to use it. Nino uses liquify for corrections and stylistic choices, and done with anatomy/physique kept in mind.
What is a secondary correction? Nino will often pause in his workflow after he has done the majority of the heavy skin work to take a second look at all the colors in the frame. Getting certain areas under control will allow the image to take the color grading even better.