Advice on how to replicate this

Hey, I was wondering how someone could help me figure out how to edit a video the way this guy did from 0:20-0:22 and 0:28-0:31 [(https://youtu.be/CazgzSoHy9s?t=20) and (https://youtu.be/CazgzSoHy9s?t=28)]. I tried playing around with velocity settings but it didn't feel right and it also felt harder to sync the vid with audio, I also see he's using some kind of blur and greyscale but I have no idea how to do that, does anyone have any tips?

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VEGAS PRO 17

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HARDWARE:

Ryzen 5 3600x

RTX 2060

32gb 3000hz DDR4 ram