I saw them interviewed this morning. Apparently they got caught up trying to escape and the police used shields to push the rioters back and she fell and started freaking out as police tried to force them back with the shields. After a couple seconds the police moved forward. The guy was trying to calm her down from being so freaked. There is also overhead video of the whole thing.

I hadn't noticed it till just now, but having seen that photo a dozen times, I defaulted to the people in the background being rioters and the couple in a DMZ with the cops being closest to the photog. Now I see that the gap is between the police front and the police support.