He demanded the cash from the register, and the cashier started giving it to him . . . until a 58-year-old customer named Cragg Jerri decided to step in. Apparently Cragg's a regular there, so he picked up a metal chair, SLAMMED Ryan in the back with it . . . and then started brawling with him.
Eventually he wrestled the knife away. He wound up getting stabbed in the process, but he ALSO got a few nice stabs in on Ryan too.
Ryan was taken to the hospital, and once he's out, he'll be facing charges for attempted armed robbery and assault with a deadly weapon.