[Ken H]

I see nothing of the kind. For the first couple of seconds, she's walking right past the cops and they don't even seem to notice her.

She and the cop then react at the same time to the water (or string?) that was tossed by the person in the black sleeves.

[Uncle Chip]

Watch it again.

She didn't start from the curb. She starts from over by the group of police and is hopping up and down as if agitated. She is saying something to the police the whole time.