2 EMS HELIS HAD AN NMAC. ONE WAS DEPARTING AN ARPT HELIPAD AND THE OTHER WAS ARRIVING.

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I DROPPED OFF THE FLT CREW; MR X AND MR Y; AT THE HOSPITAL TO BEGIN PATIENT PREPARATION WHILE I WENT TO REFUEL THE ACFT AT THE ZZZ1 ARPT. WHEN I RETURNED TO ZZZ; THE WINDS WERE OUT OF THE SW AND I LANDED TO THE S. I SHUT DOWN THE ACFT AND THE CREW LOADED THE PATIENT. WHILE I WAS GOING THROUGH MY RUN-UP PROCS THE CREW INFORMED ME THAT ANOTHER HELI WAS COMING TO PICK UP A PATIENT AS WELL. I ASKED WHEN THE HOSPITAL THOUGHT THEY WOULD ARRIVE AND MR X SAID THAT THE HOSPITAL HAD NOT HEARD IF THE OTHER HELI HAD EVEN LIFTED OFF AND DID NOT KNOW WHEN THEY WOULD ARRIVE. PRIOR TO LIFTING OFF; I PERFORMED MY PRE TKOF CHKS AND CALLED OUT 'CLR L; R; AND ABOVE.' MR X RESPONDED; 'CLR L' AND MR Y RESPONDED 'CLR R.' THE ZZZ HELIPAD IS SITUATED NEXT TO THE HOSPITAL WITH MARKED WIRES ON THE S SIDE OF THE HELIPAD. THE HOSPITAL BUILDING BLOCKED MY VIEW OF MY DEP PATH WHILE ON THE HELIPAD. THE WINDS WERE STILL R QUARTERING OFF THE NOSE. AS I BEGAN TO CLB OUT OF THE HELIPAD TO THE S; AT AN ALT OF APPROX 20-30 FT; PERSON SITTING ON THE L SIDE; CALLED OUT 'ACFT COMING FAST; 9 O'CLOCK POS.' I LOOKED L AND SAW A BELL JET RANGER APCHING AT A VERY HIGH RATE OF SPD AND HDG DIRECTLY FOR THE HELIPAD WHERE IT APPEARED TO BE SETTING UP FOR A LNDG TO THE N. I IMMEDIATELY STOPPED MY TKOF. I WAS IN A CRITICAL POS WITH THE WIRES IN FRONT AND THE BUILDING TO MY L. I COULD NOT DSND BECAUSE OF THE WIRES AND BEGAN AN IMMEDIATE R TURN TO AVOID A COLLISION. THE JET RANGER CAME WITHIN 100 FT OF US WHEN IT HESITATED AND THEN BROKE L OFF OF THE APCH. I IMMEDIATELY STOPPED MY R TURN TO AVOID CLBING INTO THE NEW FLT PATH OF THE JET RANGER AND ENTERED AN OUT OF GND EFFECT HOVER WHILE WATCHING THE JET RANGER. THE JET RANGER CONTINUED TO CIRCLE TO THE W OF THE HELIPAD AND I PROCEEDED TO TAKE OFF TO THE S. THE JET RANGER HAD MADE A TIGHT TURN BEHIND US AND WAS LNDG ON THE HELIPAD AS WE WERE CLBING OUT. I NOTIFIED DISPATCH OF THE INCIDENT AND THEY IN TURN NOTIFIED OUR BASE. THE FLT CONTINUED WITHOUT FURTHER INCIDENT.