Reversed.

Gojo has seen the signs, and saw Geto drifting away, but it was too fast so he couldn't react. (SPOILERS!) He laid on the ground, hearing Sukuna's words of praise as his vision gained blurry, he heard something shouted. Before he could make it out, he woke up in his old highschool desk, someone or something had reversed time. He was to relive it, this was a sign, he had to stop Geto before it happened.

I do not own JJK the actual creator of JJK is Gege Akutami