HELI SPI TAKES OFF HDG TOWARD ACTIVE RWY. CAUSES GAR.

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TWR ISSUED INSTRUCTIONS FOR DEP DIRECTLY FROM PARKING LOCATION OF HELI IN GRASS AREA. INSTRUCTIONS WERE INTENDED TO KEEP ACFT W OF ACTIVE RWY 35. PLT DEPARTED ON HDG THAT WOULD HAVE TAKEN ACFT ACROSS RWY 35. PLT DEPARTED ON HDG THAT WOULD HAVE TAKEN ACFT ACROSS RWY 35. TWR SPOKE ABRUPT INSTRUCTIONS NOT TO CROSS RWY 35. PLT REALIZED THAT DEP PATH WAS XING ACTIVE RWY. PLT STOPPED AND TURNED BEFORE RWY AND RETURNED TO PARKING LOCATION. HAD PLT CONTINUED HE MIGHT WELL HAVE CROSSED THE ACTIVE RWY AND CREATED A TFC CONFLICT. SUGGESTION: IT SHOULD BE MANDATORY THAT ANY STUDENT PLT OF A HELI IDENT HIMSELF AS A STUDENT TO ATC. GIVEN THE DEMANDS OF HELI FLT AND POTENTIAL DEP/ARR PATHS WHICH ARE UNLIMITED; THERE IS A POSSIBILITY OF INCIDENTS CAUSED BY ATC/PLT INSTRUCTION CONFUSION. IF ATC KNOWS THAT A PLT IS A STUDENT; THEN MORE STANDARD RTES CAN BE USED OR; AT THE LEAST; INCREASED VIGILANCE CAN BE EMPLOYED. SUPPLEMENTAL INFO FROM ACN 276765: NORWOOD TWR CLRED THE HELI FOR TKOF FROM THE GRASS OR TXWY AREA ADJACENT TO AND W OF RWY 35 WITH CLR INSTRUCTION TO THE HELI TO REMAIN W OF RWY 35. I HAD MY ACFT CONFIGURED GEAR DOWN; FULL FLAPS WITH STROBE AND LNDG LIGHTS ON. I WAS ENTERING THE FLAIR PORTION OF MY LNDG WHEN I OBSERVED THE HELI LIFT ON AN EASTERLY HDG. I THEN OBSERVED THE HELI TRANSITION TO FORWARD FLT ON AN EASTERLY HDG DIRECTLY IN FRONT OF ME. I ABORTED MY LNDG AND INITIATED A CLBING L TURN GAR TO AVOID A COLLISION. I DON'T BELIEVE THE TWR ADVISED THE HELI OF MY POS WHEN ISSUING THE HELI TKOF CLRNC.