Never stop where you...block ANYTHING. If you want to watch a friend or wait for someone stop on the top of a roller or table way to the right or left completly out of the way and only then if there is room to safely do this and people can see from far above.
pisses me off more than this. If you want to have fucking pow-wow with your "crew" go sit on the sofa in your house. Don't do it anywhere there is snow that people are going to want / need to ride to get from point A to point B. If you do want to pow-wow, get your ass as FAR
to the side of the park / trail as you possibly