AN EMB120 PAX FLT ATTEMPTS TO HOLD SHORT OF RWY 30 WHEN HEARING AN ATX CARGO FLT ANNOUNCE HIS DEP FROM RWY 12 AT VIS; CA.

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OUR ACFT LOADED PAX AT THE TERMINAL; LISTENED TO LCL AWOS AND; BASED ON WIND OF 310 DEGS AT 5 KTS; TAXIED TO RWY 30. WE ANNOUNCED OUR INTENTIONS OVER THE CTAF. HOLDING SHORT OF RWY 30; WE WENT OFF FREQ FOR 1-2 MINS TO OBTAIN OUR IFR RELEASE FROM FAT APCH CTL; AND THEN WE RETURNED TO THE CTAF. THE RWY APPEARED TO BE CLR; AND WE ANNOUNCED OUR INTENTION TO DEPART RWY 30. AS I BEGAN TO TAXI TOWARD THE HOLD SHORT LINE; A CARGO PLT ANNOUNCED THAT HE WAS DEPARTING RWY 12; SO I STOPPED MY ACFT IMMEDIATELY. ALTHOUGH WE REMAINED WELL CLR OF RWY 30/12 PER SE; MY ACFT'S NOSE CAME TO A STOP ABOUT 5-6 FT PAST THE HOLD SHORT LINE; AND I HAD NOWHERE TO GO TO REVERSE THAT POS. THIS ALL TOOK PLACE WITHIN A FEW SECONDS AND WHEN MY FO AND I THEN LOOKED DOWN THE RWY A SECOND TIME WE SAW THE CARGO PLANE IN THE EARLY STAGES OF A TKOF ROLL. AS THIS WAS HAPPENING; I THEN ASKED THE CARGO PLT IF HE HAD MADE AN EARLIER CALL ON THE CTAF; AND HE SAID THAT HE HAD. I THEN TOLD HIM OVER THE TA THAT WE WERE UNABLE TO COMPLETELY HOLD SHORT OF THE HOLD SHORT LINE; AND HE RESPONDED BY SAYING THAT HE WAS ALREADY ROTATING; MAKING WHAT APPEARED TO BE A NORMAL TKOF. AFTER THE CARGO PLANE WAS CLR OF THE AREA; WE ANNOUNCED OUR DEP AND DEPARTED RWY 30. IF THE CARGO PLT MADE AN EARLIER CALL THAT HE INTENDED TO DEPART RWY 12; IT MAY BE POSSIBLE THAT WE MISSED IT AS A RESULT OF TALKING TO THE APCH CTLR WHILE OBTAINING OUR IFR RELEASE. ALSO; WHY WE DID NOT NOTICE ANOTHER ACFT ENTERING THE OPPOSITE RWY TO OURS; I DO NOT KNOW. THE RWY DID APPEAR CLR; BUT HE MAY HAVE ENTERED IT QUICKLY AS WE TAXIED TOWARD THE HOLD SHORT LINE FOR RWY 30. WE DO NOT KNOW. FINALLY; ALTHOUGH THERE IS NO RULE ABOUT TAKING OFF DOWNWIND AT UNCTLED ARPTS; IT ALWAYS INCREASES THE CHANCE OF A CONFLICT.