OK, I never comment, but I replayed it about ten times to see, the "Trip"  she ran into his heel, that is not tripping, that is I wasn't watching where I was going, then she whined about it as if he did it on purpose despite saying he didn't after she landed on the ground.  I could see if she actually tripped because someone's foot was out, but she ran into the back of his heel; that is one you have to blame on yourself.  I've had it happen.