Where is that being reported?
Its mostly anecdotal, with people reporting it in their comments about the video. I can’t r/o that its hearsay. I’ve been so many places I can’t back track them all.
This is one of the articles that talks about his behavior and the sequence of events which seemed credible to me.
http://wtvr.com/2017/04/12/united-fallout-two-more-officers-placed-on-leave/
and this narrated video You can skip to the 1:45 mark where she shows the video and explains the back story.
https://www.youtube.com/watch?v=tmxcTtS22u8