Caution: the videos contain a pretty graphic scene of a man being beaten horribly. Seriously, don't watch it if that bothers you or you're squeamish.
Apparently, he was trying to defend a shop (his own?) from looters and rioters, and for whatever reason decided to do so with a sword or machete. It was initially believed that he rushed the crowd to attack them, but a second video shows that he was running away from an attack, only to end up being beaten mercilessly.
In a later segment - not in this video - the man who recorded it, described the attack as a literal stoning, then said some of them laughed it off while the guy was bleeding in the streets and went right back to looting.
His exact condition is uncertain, but it appears he received medical attention and was taken from the scene.
We all need to be in prayer for our country right now. Even here in Lincoln, NE there are violent "protesters" (more like rioters) destroying and vandalizing property. Just last night, the police had to break up a group with tear gas and rubber bullets.
Once again, don't watch if you're squeamish, especially the second video up on Twitter (which also includes a lot of vulgarities, besides).