It's comically childish to say if it's not on vidio it didn't happen.
What if the event is on video and the video does not show it?
The chances of something that inflamatory happening and NOT getting caught on cell phone video is just about nil.
This isn't like Bigfoot not getting filmed in the trackless expanse of the Rocky Mountains. This is something that supposedly happened in the most electronically recorded area on the planet with literally thousands of interested parties in attendance trying to bait a response from a crowd.
In this particular case, if it's not on video, it very likely did not happen.