New York resident Edward Jacob Lang made no secret of his involvement in the D.C. insurrection, according to the Federal Bureau of Investigation. He posted pictures and video, proudly admitting he was there. Not only that, but he allegedly pointed himself out as one of the people attacking Capitol police.
From the affidavit:
A recording of the video story (that the screenshot depicted above apparently came from) was posted on Twitter. In the video recording, you can see an individual raising a riot shield over his head as the crowd cheers and then violently slam the shield down on the ground repeatedly near where the officers are visibly lined up.