Baltimore police, enforcing the mandatory curfew that went into effect Tuesday night, are dizzyingly efficient.

Like this arrest, caught on CNN cameras: now you see the protester, now you don’t. Where did he go? No comment.

[There was a video here]

Update 11:22 pm: According to a Twitter user, the man may have been student activist Joseph Kent, who also participated in the Ferguson protests.

Police just arrested Joesph Kent, student of Morgan State University. Swat truck came up on him, drove by then disappeared. Wow. #Baltimore April 29, 2015

Update 10:03 am: Kent is being held at Central Booking but is “ok and safe,” according to attorney Stephen Beatty.