Was this the first time a party in McKinney has ever been broken up? Seriously. Isn't thing basic policing? I imagine a vast majority of people on here have been to a illegal party (location, alcohol, drugs, etc) that was police broke up.
In my experience cops never busted in like rambo ready to shoot me. What usually happens is that police show up and everyone runs - just like in this video. That is standard teenage party behavior. The difference is police usually don't give a **** - they have real things to do that is important. Their main goal is to just break up the party and for folks to go home. So they flash their lights and people run away. Done deal. End of story.