What is Carey Bell Doing?

Check it out at about 6:17. It looks (to me) like he’s at the wrong end of the harp to be getting notes in that register so he must just be bending the hell out of them. Impressive. This is what comes to my mind when I hear someone refer to the Chicago chromatic sound.

Carey Bell & The Sons Of Blues / Easy to Love You (1982)

Beats me, unless those are vocal sounds through the harp.
Looks like a Hohner 280, and I heard a lot of notes that may have been coming from another harp player.