Some stenographer wrote a story for Bay City News (no idea what that outlet is) based entirely on the prosecutor's statement.
https://patch.com/california/san-francisco/amp/32193797/man-convicted-in-safeway-machete-attack
What the statement and story leaves out is that the security guards made this a lot worse by how they handled it. They used a very slight provocation to prompt a fight. By their own testimony, they should have done something very different. (I'll post something to my blog this weekend.)