Here is the situation, About to go to the store buying some stuff for home,

When i am about to drive in, i see a girl with 2 guys, in the parking lot, 3 native indian native people, pretty young maybe 15-17 one of the guy is holding her by the hips, she is smiling, but you cant tell she is not comfortable. The guy is holding her on himself, strong, she is trying to escape but she can't. The other guy is making fun of her and taking picture of her with his phone.

I almost ask her if she needed help, but i stop, because she was smiling and sometime hug him. It was fucking borderline for me, it was hard to tell if she was smiling out of fear or just playing hard to get.

Did i do the right choice to let it go? what would you have done? Do i have 'white knight' tough?