A C182T PLT; INSTRUCTING A STUDENT ON SOFT FIELD LNDGS AT 9B1; DID NOT TAKE CTL OF THE ACFT IN TIME TO PREVENT RUNNING OFF OF THE END OF THE RWY AND IMPACTING A FENCE.

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MY STUDENT AND I WERE ON A TRAINING FLT; WORKING ON PILOTAGE AND SHORT FIELD LNDGS. LNDGS HAD BEEN MADE AT PREVIOUS ARPTS ALONG WITH THE ARPT AT WHICH THE INCIDENT OCCURRED. WT AND BAL CALCULATIONS HAD BEEN COMPLETED ALONG WITH TKOF AND LNDG PERFORMANCE CALCULATIONS FOR EACH ARPT OF INTENDED USE. THE EVENT OCCURRED ON THE THIRD FULL STOP TAXI BACK LNDG AT 9B1. FULL SHORT FIELD PROCS WERE FOLLOWED BY THE STUDENT; AND AIRSPD WAS PROPERLY HELD THROUGHOUT. ON SHORT FINAL TO RWY 32; DSCNT RATE BEGAN TO DECREASE; AND IT WAS DETERMINED WE MAY HAVE PICKED UP A SLIGHT TAILWIND. OUR APCH BECAME TOO HIGH INTO 9B1; AND WE LANDED JUST PRIOR TO MIDFIELD. THERE WAS PLENTY OF ROOM TO DO A GAR; WHICH WAS WHAT I; THE INSTRUCTOR; WAS PLANNING ON DOING. WE HAD PASSED THE GAR POINT ON THE RWY; HOWEVER; WHEN WE TOUCHED DOWN. THE STUDENT FROZE AT THE CTLS AND LOCKED THE BRAKES UP. I TOLD HIM TO 'RELEASE THE BRAKES;' BUT HE DID NOT COMPLY. I THEN ORDERED HIM TO 'CLR THE CTLS.' I HAD TO PUSH HIS HAND OFF THE THROTTLE TO GET HIM TO RELEASE; AT WHICH POINT HE ALSO RELEASED HIS FEET FROM THE BRAKES. THERE WAS A FENCE AT THE END OF THE RWY; WHICH WE IMPACTED LIGHTLY. AT NO TIME WAS THERE A GAR BY THE STUDENT; OR WHEN I FINALLY GOT CTL OF THE ACFT; ATTEMPTED. NO ONE WAS INJURED AND DAMAGE WAS A BENT PROP AND SPINNER. WHEN I FINALLY GOT CTL OF THE ACFT; A GAR WOULD HAVE NOT BEEN POSSIBLE; DUE TO A POND AND HOUSE AT THE END OF THE RWY.