I'm completing the campaign on my last character, but when it comes to free the Traveler from the web in the Altar of Reflection (where you kill the witches to free it), as you can see in the attached video, I can't access to that one portal, preventing the completion of the campaign. I've already tried to return to orbit and relaunching from the checkpoint, but it didn't work.
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Slide into a portal, Or, Hop on top of it, then kill the wizzard with some strong ranged weapon, preferably one whose sights mark enemies.