If the Witness him/herself is paracausel, how can we defeat them? And would we want to?
My take on it is that we won't fight the Witness head on but we will stave off their attacks in some way. I'm looking forward to seeing how this all unfolds in Lightfall and the Final Shape.
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Rasputin is going to invade the vex network and find a way to shield the traveler and humanity by sending us to a different timeline.