Like the title of the article and the video says Manny Machado and Tatis Jr needed to be separated after they both got into a verbal altercation. It seems like Machado is doing the most yelling and seems to be upset with something. If you listen you can hear Machado say “Its not all about you”
It looks like the altercation stemmed from when Tatis Jr struck out, he was slamming his helmet on the bench and causing a scene, making the situation all about him and not the team who is currently fighting for a Wild Card slot.
You can also here Manny say, “Your the fucking best player go do something” looks like Manny is giving star studded Tatis a reality check which is probably needed. It is tough love for sure, but certainly Tatis Jr does not need to act like that.