CH7A PLT AND CFI EXPERIENCE LOSS OF CTL ON LNDG ROLLOUT AND CAUSE DAMAGE TO A TXWY LIGHT AND BOTTOM OF ACFT AT OJC; KS.

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FRONT SEAT PLT (FSP) (TRAINEE) WAS EXPERIENCED CFI; BUT NOT YET CONVENTIONAL GEAR QUALIFIED. THIS WAS HIS SECOND CONVENTIONAL GEAR (TAILWHEEL) TRAINING FLT IN THE CITABRIA. I WAS IN THE REAR SEAT ADMINISTERING THE TRAINING. FSP (FRONT SEAT PLT) MADE A 3 POINT LNDG AND WAS ROLLING OUT; SLOWING DOWN TO EXIT RWY ON TXWY TO THE R. FOR WHATEVER REASON; THE ACFT VEERED SHARPLY TO THE L AND FSP (FRONT SEAT PLT) INITIATED A GAR AND WE DEPARTED THE RWY AT A 45 DEG ANGLE AND BECAME AIRBORNE. UNFORTUNATELY; WE DID KNOCK OFF A TXWY LIGHT AND TORE FABRIC IN BOTTOM OF THE AIRPLANE. WE FLEW A CONVENTIONAL L-HAND PATTERN AND LANDED THE AIRPLANE WITHOUT INCIDENT. THE REAR SEAT PLT DOES HAVE FLT CTLS: STICK AND RUDDER. I KEEP MY FEET LIGHTLY ON THE RUDDER SO AS TO SENSE ANY RUDDER INPUT FROM THE FSP (FRONT SEAT PLT). HOWEVER; HE MIGHT HAVE APPLIED BRAKES TO SLOW DOWN FOR THE TURN OFF THE RWY (R) ONTO THE TXWY AND APPLIED TOO MUCH L BRAKE. I CAN THINK OF NO OTHER APPARENT REASON FOR THE SHARP L TURN. THE TWR RPTED THE WINDS ESE AT 4 KTS.