Sans is extremely violent, basically the other monsters are scared of the skeleton brothers and Sans especially. Still has a bit of “innocence” in certain aspects. He shows this when he says he’s going to capture you and bring you to Alphys but he doesn’t know what will happen. His guess is decapitation. He also isn’t positive you are a human at first, like in traditional UNDERTALE. Sans isn’t aware of Papyrus’ ability to take a “shortcut”.

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