Tyreek Hill arrested for traffic violation by stadium in Miami on gameday (Hill played) [Reckless driving & seatbelt charges dismissed]

I don't know the law, but I think it should be illegal to roll the window up when pulled over no matter what the infraction.
Why? That's never been a rule that I'm aware of, and if it's raining, windy, whatever, if the cop isn't at the window talking to the driver, there's no need for the window to be down. It's a silly requirement.
Cops shouldn't have to guess whether you're grabbing a weapon.
They shouldn't, but that's why the window goes down when the cop gets to the window, and of course both hands visible. But a window cracked open doesn't mean they can't see.
And quite frankly, knowing it was Tyreek Hill would not put my mind at ease if it was the cop. Hill is a criminal and unstable.
So what? You expect cops to be scared every time the roll up on someone? If that's the case, the cop needs to be re-trained.
Lose the attitude and stop acting like an entitled jackass and comply with simple instructions.
Everyone responds to stressful situations differently. The cops are the ones with the gun and the ones who are supposed to be in control. I've dealt with loud people before in my previous lines of work. The best thing to do is do my job as best I can and ignore the drama to the extent possible. My goal was always to try and defuse situations. Usually it works. Some people aren't good at following instructions, that doesn't mean we have to be confrontational about it. The cop had the documents that Hill had already given him and all he had to do was ignore Hill and go write up the ticket. The cop chose to respond to Hill's words rather than do his job. He took it personally. The opposite of professional.
As for detaining the other two. Stay the hell out of it. Cops don't need you crowding around.
Uh, no, cops are grown arse men. If they can't handle people coming to try and defuse a situation, and they don't have the self-awareness to realize how this all looks, there's a problem here.
Again it comes back to simply not being able to follow simple commands. It's like some people just have to be arses to cops.
Most people aren't, but sometimes people are having a bad day, sometimes people have other things on their mind, while others might have already had a bad experience and are scared themselves. A cop should understand they're the ones with a gun and they're the ones who need to have situational awareness when it comes to how to approach people. Some people will definitely make trouble and deserve a firm response, but in this situation, the response wasn't measured at all.
About 90 percent of police shootings wouldn't even happen if the idiot just listened to the cop.
How do you know that? And no, common sense isn't a valid answer.