You have to get the whole episode. You have to get him approaching you… Leaving and everything else in between.
I recently watched a video about how a news team, in Australia, followed a man whose soon had been accused for something. It was of some importance. Well one news team followed another that followed the man for twenty minutes and stuck their cameras in his face the man asked repeatedly to please give him some space and then the eventually got to close and he pushed them back. The camera crew then proceeded to call the man a terrorist and then things got ugly. The second crew documented all of this and eventually discredited the first because, of course, all they showed of the man is him losing his cool.
Point is that even video is suspect due to editing.
It has to appear that the video shows the whole event start to finish otherwise it will be suspect.