SMT X UNAUTH RWY ENTRY HAD LTSS FROM SMT Y LNDG. EVASIVE ACTION TAKEN. PLTDEV.

Narrative

SMT X WAS CLRED TO LAND ON RWY 6 AT BARNSTABLE MUNICIPAL ARPT. AFTER LNDG AND CLRING RWY 6 ON TXWY INDIA; I HEARD THE TWR (LCL) INSTRUCT COMPANY TO 'STAY WITH ME TO THE GATE!' THIS WAS A COMMON PHRASE ALL WINTER LONG. I WAS INFORMED LATER THAT I WAS INSTRUCTED TO GAR WHICH I DID NOT HEAR. I ASSUMED THAT I WAS TO 'STAY WITH THE TWR (LCL) TO THE GATE. AS I WAS TAXIING TO THE GATE; THE TXWY CROSSED RWY 33. I ENTERED RWY 33 HALFWAY AND NOTICED ANOTHER COMPANY SMT Y HAD LANDED. HAD I AND THE COMPANY PLT NOT TAKEN EVASIVE ACTION WE WOULD HAVE CRASHED. I IMMEDIATELY TURNED MY ACFT TO THE R WHILE BRAKING HARD TO AVOID COLLISION AND THE COMPANY PLT WENT TO HIS L STAYING ON THE RWY ALSO AVOIDING COLLISION. THE FEMALE CTLR; WHO HANDLED LCL CAME DOWN TO COMPANY OPS FOR A CONFERENCE. DURING WHICH AT THIS TIME IT WAS REVEALED THAT SHE AND THE PERSON DOING GND WERE ARGUING ABOUT WHEN AN ACFT LANDS IT SHOULD BE TURNED OVER TO GND AND NOT STAY WITH LCL. ANOTHER POINT; FROM TXWY INDIA WHERE I HAD TURNED OFF FROM RWY 6 ON TO CHARLIE TXWY TO THE INTXN OF CHARLIE AND RWY 33 TAKES APPROX 45 SECONDS TO 1 MIN. THE LCL CTLR INFORMED ME THAT THE GND CTLR WAS 'SCREAMING' ON THE GND FREQ; WHICH I WAS NOT ON GND; I WAS STILL ON TWR. WHY DIDN'T THE GND CTLR INFORM LCL THAT I WAS NOT COMMUNICATING WITH HIM? WHY DIDN'T LCL TELL ME TO HOLD MY POS? I FEEL IF THE CTLRS WORKED TOGETHER RATHER THAN ARGUING THIS TYPE OF SIT COULD BE AVOIDED.