A GATE AGENT ATTEMPTED TO OPEN A B737-300 L1 DOOR BEFORE DOOR DISARMING. THE FWD FLT ATTENDANT STOPPED HIM RESULTING IN A SLIGHT FLT ATTENDANT HEAD INJURY DURING RESTRAINT.

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WE ARRIVED IN ZZZ. THE ACFT WAS PARKED AND THE SEATBELT SIGN WAS TURNED OFF. THE COCKPIT HEARD SOME YELLING FROM BEHIND OUR COCKPIT DOOR. AFTER OUR PARKING CHKLIST WAS COMPLETE; WE OPENED OUR DOOR TO FIND OUT WHAT WAS GOING ON. OUR PURSER TOLD US THAT THE ARRIVING GATE AGENT TRIED TO OPEN THE ACFT DOOR AT 1L WITHOUT CLRING THE DOOR FIRST WITH THE FLT ATTENDANT. OUR FLT ATTENDANT YELLED AT THE GATE AGENT THAT THE DOOR WAS NOT DISARMED YET. AS THE DOOR STARTED TO OPEN; OUR FLT ATTENDANT LEANED OVER FROM HIS JUMPSEAT TO STOP THE DOOR FROM OPENING. THE DOOR HANDLE FROM 1L STRUCK OUR FLT ATTENDANT ON THE FOREHEAD RESULTING IN A SMALL CUT THAT STARTING BLEEDING. HE ALSO STOPPED THE DOOR FROM OPENING. OUR FLT ATTENDANT CONTINUED TO DISARM THE DOOR AND INFORM THE AGENT THAT IT WAS 'NOW' CLR TO OPEN 1L. THE PLANE DEPLANED WITHOUT FURTHER INCIDENT. SOP WAS NOT BEING FOLLOWED FROM ZZZ GATE AGENT. A SLIDE DEPLOYMENT IN THE CONFINED JETWAY COULD HAVE BEEN DEADLY. THE AGENT APOLOGIZED AND QUICKLY LEFT THE SCENE.