[ It such an innocent thing to say, and Obi-Wan smiles sadly. Sometimes it is easy to forget how young some of these people are. Rex may be boisterous and exceedingly strong with his powers, but he is still a teenager, caught in the age between Ahsoka and Anakin, both of them with grasping at hope and believing in their own power to alter the course of the universe.
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How could he possibly tell Rex that it cannot be stopped because it is quite literally too late? That Anakin has fallen, has had a hand in killing their family? That Palpatine has already taken power, labeled the Jedi as traitors, and single-handedly upended the galaxy as he knew it? All he can do now is go to Mustafar and pray he and Padmé will be enough to bring him to his senses. For if the two of them cannot, all will be lost. ]
Is that how you have approached things so far?