FOLLOWING A SUCCESSFUL SINGLE ENG LNDG; INSTRUCTOR PLT OF PA34 RESTARTS MALFUNCTIONING ENG WHICH GOES TO FULL PWR AND PROPELS THE ACFT BACK ONTO THE ACTIVE RWY.

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IN SUM: THE INSTRUCTOR PLT AND HIS STUDENT PREPARED THE PA34-200 SENECA FOR A TRAINING FLT. THE STUDENT WAS FROM ANOTHER COUNTRY AND ENGLISH WAS A SECOND LANGUAGE. SOME LANGUAGE BARRIER ISSUES CONTRIBUTED TO THE EVENTS THAT FOLLOWED. THE INSTRUCTOR EXPLAINED TO THE STUDENT THAT THE ONLY FOOT BRAKES ON THE PA34 WERE ON THE L (STUDENT'S) SIDE OF THE COCKPIT AND THE STUDENT WOULD BE RESPONSIBLE FOR THEIR OP. THE INSTRUCTOR FURTHER ADVISED THAT; IN THE EVENT OF AN EMER; THE INSTRUCTOR WOULD UTILIZE THE HAND BRAKE AS A LAST RESORT. UPON TKOF; IT WAS DISCOVERED THE L ENG WOULD NOT RESPOND TO THROTTLE MOVEMENT AND REMAINED AT TKOF PWR. UNABLE TO CORRECT THE PROB THE INSTRUCTOR DECLARED AN EMER AND RETURNED TO THE DEP ARPT. 2 ATTEMPTS AT LNDG WERE MADE. THE FIRST WAS ABORTED PRIOR TO TOUCHDOWN BECAUSE OF THE HIGH PWR SETTING ON THE L ENG. AFTER SHUTTING DOWN AND SECURING THE L ENG; THE SECOND APCH TERMINATED IN A SUCCESSFUL TOUCHDOWN. THE INSTRUCTOR PLT ATTEMPTED TO GET THE STUDENT TO APPLY THE BRAKES BUT THE LANGUAGE BARRIER PREVENTED SUCCESSFUL COM. THE INSTRUCTOR PLT THEN SHUT DOWN THE R ENG IN AN ATTEMPT TO SLOW THE AIRPLANE WHILE SIMULTANEOUSLY APPLYING HAND BRAKE. AFTER STOPPING ON THE RWY THEY RESTARTED THE R ENG AT THE TWR'S REQUEST IN ORDER TO CLR THE RWY FOR WAITING DEPS. DURING TAXI BACK TO THE RAMP ON THE PARALLEL TXWY; THE INSTRUCTOR PLT ATTEMPTED TO RESTART THE L ENG. WHEN IT STARTED IT AGAIN WENT TO FULL THROTTLE; TURNING THE ACFT TO THE R; ACCELERATING IT ACROSS THE UNIMPROVED SURFACE AND BACK ONTO THE RWY WHERE AN ENCOUNTER OF UNSTATED SEVERITY OCCURRED WITH A DEPARTING ACFT. THE ENGS WERE ONCE AGAIN SHUT DOWN AND THE ACFT TOWED TO PARKING. SUBSEQUENT INVESTIGATION AND INTERVIEWS WERE CONDUCTED WITH THE FBO SAFETY DIRECTOR AND ARPT OPS.