I'm curious on what you all think. We see the traveler starting to leave then stops. Now does it stop because as the Witness says it has no where else to go or does it stop because we nuked the warsat network which was humanities last line of defense, so it sees something good in us or a reason to stay and protect?
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This is easy. It stops because Ana was still deciding to let Red sacrifice himself. Giving us the chance to make the right decision. It was glowing because it was getting ready to reset time and try again. What we did was the right thing and it staying is the proof we are on the right course.