HELICOPTER PILOT REPORTS ANOTHER HELICOPTER BEING FLOWN IN A RECKLESS MANNER; ENDANGERING BOTH HIM AND PEOPLE ON THE GROUND.

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ON THE ABOVE DATE AND TIME MY PARTNER AND I WERE ENGAGED IN LOW LEVEL AERIAL PHOTOGRAPHY OF BOATS GOING TO AND FROM GUU AND HARSENS ISLAND AREA. THIS WAS DURING AN EVENT CALLED JOBBIE NOONER WHICH DRAWS THOUSANDS OF BOATERS THAT PARK AT THE TIP OF HARSENS ISLAND AT GULL ISLAND WHICH IS APPROX 40-50 YARDS IN DIAMETER. WHILE IN THE AREA WE NOTICED A WHITE HELI FLYING 15 FT TO 20 FT DIRECTLY OVER HUNDREDS OF PARKED BOATS. THIS HELI WAS HOVERING SO LOW THAT ITS ROTOR DOWNWASH WAS BLOWING TOWELS OFF THE BACK OF PARKED BOATS. I ATTEMPTED TO CONTACT THIS PLT ON THE HELI AIR TO AIR FREQ TO NO AVAIL. I THEN CALLED ZZZ TWR TO RPT THIS RECKLESS HELI. THE CTLR ASKED ME TO GET CLOSE ENOUGH TO GET THE TAIL NUMBER WHICH WE DID WHILE TAKING PHOTOS OF IT. WE THEN FLEW AWAY AND RESUMED TAKING PHOTOS OF THE BOATS WHEN THIS HELI BEGAN FOLLOWING US APPROX 50 FT DIRECTLY BEHIND US. I CHANGED COURSE AND ALT NUMEROUS TIMES THE ENTIRE TIME. THIS UNKNOWN HELI CONTINUED TO FOLLOW DIRECTLY BEHIND US. WHILE RPTING THIS TO ZZZ CTLR; HE ORDERED ME TO FLY DIRECTLY AT THE CTL TWR SO THAT THEY COULD SEE THIS ACFT. UPON APCHING THE OUTER RING OF CLASS D AIRSPACE THIS HELI PULLED UP DIRECTLY NEXT TO OUR R REAR QUARTER AND THEN DID A STEEP L BANK TURN DIRECTLY OVER OUR ROTOR DISC AND DID 180 DEG TURN AVOIDING THE CLASS D AIRSPACE. THE CTLR ADVISED US THEY HAD NORAC WITH THAT ACFT NOR DID THEY KNOW WHO IT WAS. FURTHER THAT THEY WERE CONTACTING THE FAA AND RPTING THIS AND THAT THEY WANTED ME TO DO THE SAME. MY PARTNER IS ALSO A COMMERCIAL HELI PLT AND PHOTOGRAPHER. BOTH OF US WERE IN FEAR OF OUR LIVES DUE TO THE CLOSE PROX OF THIS HELI RECKLESSLY FOLLOWING US WITHOUT TALKING TO US OR ZZZ TWR. PRIOR TO THIS WATCHING HIM HOVER DIRECTLY 20 FT OVER HUNDREDS OF PARKED BOATS I COULD ONLY THINK HOW MANY PEOPLE WOULD HAVE DIED HAD HE LOST HIS ENG. THIS PLT DID NOT HAVE ANY AIRSPD OR ALT THAT WOULD HAVE ALLOWED HIM TO AUTOROTATE TO THE SURFACE WITHOUT KILLING INNOCENT BOATERS! THIS PLT'S BLATANT DISREGARD FOR THE SAFETY OF OTHERS FURTHER ELEVATED FEAR IN US WHEN HE BEGAN TO CHASE US.