Yes, that is an interesting question.
They were young women, not children. I had no idea from watching the video that they were lesbians and I don't know if the fact that they are lesbians is relevant. I have never seen them in any videos before. Is it known or just being assumed that they are lesbians? (Genuine question, not rhetorical.)
IMHO "Sidewalk Steve" did do a quietly provocative thing by going into the open space in front of the War Memorial from where the speakers were addressing the crowd.
He had no sooner arrived and stood quietly facing the crowd than a bunch of people rushed up, apparently to block the crowd from seeing him, or maybe to prevent him being centre stage if the event was being filmed?
Then the woman with the camera and dreadlocks rushed in and tried to put herself between him and the crowd pressing into him.
There was a fleeting moment when she moved in front of a woman with short hair who was holding a placard and when she was beside the woman she pointed her camera phone towards her. I am not surprised that the woman did not react because she did not appear to have been pushed, the camera seemed to be to the side of her rather than "in her face" and it was all over extremely quickly.
There seemed to be plenty of Stewards in attendance but they did not intervene to ask Steve to move and they did not have their crowd under control, which is the biggest part of their job. Instead, we saw a very familiar intimidatory manoeuvre whereby a group of people crowd in closely around an individual, blocking their view and blocking them from view of onlookers.
Relevant that Steve is a small, slight, quietly spoken older man. He stands out from the crowd, being very neatly dressed in a tweed waistcoat and flat cap and would be noticeable even without his Sandwich Board placards.
He spoke respectfully to those surrounding him, asking at least one person if they would like to speak to him and be interviewed away from the crowd. He showed he was still willing to communicate respectfully while the crowd pressed in, blocked his view, jostled him and held placards in front of his face.
That is a very unsafe situation with a mob surrounding an individual. While Steve looked only mildly surprised, the woman with the dreadlocks looked very worried about his safety and I can well understand why she rushed up to try to put some space between Steve and the people pressing in on him.