I used to dodge people stopped on knuckles, or on the undersides of rolls all the time. Now I just always assume someone's gunna jump out in front of me so I'm always ready to go evade mode. I don't do a ton if park so when I do need to put myself down to avoid a crash it ends a bit better.
However, today I was on the park and a family was watching their 8 year old kid hit jumps and were making big ole turns and stopping on the knuckle to the side. Fine. They were out if the way, in view just trying to get a good angle. So I'm drop in to hit it and the daughter if the family crosses in front of me just before the set up and turns around the jump and stops right smack dab in the middle of the knuckle, prime real estate to get your head taken out and I'm coming at her. She turns around realizes I'm still gunna hit it, and as I do I may have said get outa the way :/
And she looked at me like i was daft.... >.<
But likewise, I was coming off a side kicker on a black, three a quick 1 landed and some boarder who definitely shouldn't have been on that trail, put his nose ride threw my feet, throwing us both down. We both sat up and checked we were good, chaulked it up to lack of communication on both ends and called it a day.
Moral of the story. There's tons if people on a mountain. They're bound to get in each others way. Be aware and conscious of your surrounding and there should never be any "fault". Just keep your eyes open and don't be a full in ass hat