CITABRIA ATTAINS 3 FT OF ALT ON TKOF; TURNS 90 DEGS AND LANDS NEXT TO THE RWY IN SPITE OF INSTRUCTOR'S BEST EFFORTS.

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I WAS TRAINING A PLT IN A 7ECA CITABRIA FOR A TAILWHEEL CHKOUT. HE WAS A 4000 HR CFI WITH 25 YRS FLYING EXPERIENCE. THIS WAS HIS SECOND LESSON IN A TAILWHEEL. OUR SECOND LNDG WAS A FULL STALL LNDG; FOLLOWED BY A GAR. PWR CAME IN; TAIL UP; AND JUST AFTER LIFTOFF ACFT BEGAN TO BANK R. I CAME ON THE CTLS; BUT THE AIRPLANE DID NOT RESPOND AND BANKED VIOLENTLY TO THE R; RESULTING IN A CRASH 50 FT TO THE R OF THE RWY. POSSIBLE CAUSE; 1) STUDENT PUSHED FULL R RUDDER; AND I WAS UNABLE TO OVERPOWER HIM. HOWEVER; STUDENT WAS A CFI WITH 4000 HRS AND 25 YRS EXPERIENCE. I WOULD NOT EXPECT HIM TO DO SOMETHING LIKE THAT. IT WAS ALSO NOT A GNDLOOP -- AIRPLANE WAS AIRBORNE BEFORE ANY PROBS AROSE. 2) WINDSHEAR; BUT WINDS WERE STEADY AND LIGHT 270 DEGS AT 7 KTS. 3) WAKE TURB FROM JET THAT HAD LANDED 4 MINS PRIOR. THIS SCENARIO WOULD WORK WITH THE L XWIND AND THE LIGHT WINDS; BUT NOT THE HEADWIND COMPONENT; NOR THE FACT THAT IT WAS A 500 SERIES CITATION; WHICH DOESN'T SEEM TO GENERATE MUCH WAKE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR INDICATES THAT HE HAS HAD LONG DISCUSSIONS WITH THE FAA AND THEY HAVE COME TO NO DEFINITIVE CONCLUSION ABOUT THE ACTUAL CAUSE. THE ACFT WAS DAMAGED INCLUDING THE GEAR AND PROP AND SOME BELLY DAMAGE. NOT CONSIDERED SUBSTANTIAL UNLESS YOU ARE WRITING THE CHKS FOR REPAIRS. THE ACFT CAME TO REST 90 DEGS TO THE RWY.