POTENTIAL CONFLICT APPARENT WHILE ON FINAL APCH. SMA MAKES A GAR. UNAUTH RWY ENTRY BY SMA Y.

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APCHING FROM THE SE FROM HARRIS RANCH (308) TO LOS BANOS (LSN) IN A T-210; I MONITORED CTAF AT LSN FROM 25 MI OUT. I HEARD A SKYHAWK DOING PATTERN WORK. HIS RADIO WAS 3 X 5 AND HE HAD A STRONG ACCENT. I ANNOUNCED MY INTENTIONS TO OVERFLY THE ACTIVE RWY 32 AND ENTER L DOWNWIND AT MIDFIELD. WHEN I WAS APPROX 5 MI OUT Y ANNOUNCED TURNING L BASE. HE WAS IN SIGHT AND LANDED WHEN I WAS OVER THE THRESHOLD OF RWY 32 AT APPROX 2000 FT. I ANNOUNCED TURNING DOWNWIND AND DSNDED TO TPA OF 920 FT. I ANNOUNCED TURNING BASE; ABOUT 1 MI FROM RWY 32 I TURNED FINAL. Y CAME DOWN THE TXWY; TAXIED PAST A TOMAHAWK IN THE RUNUP AREA; WITHOUT STOPPING AND ANNOUNCED TAKING THE ACTIVE. I INFORMED HIM THAT I WAS ON A .7 MI FINAL BUT HE WAS ALREADY OFF RWY 32. I WAS SLOWED TO 85 KTS AND DSNDING AT 400 FPM. Y STOPPED ON THE RWY. I WENT AROUND IN L TFC AT 500 FT; CLBED TO 750 FT AND EXECUTED A LOW APCH LNDG. WHILE I WAS ON THE PHONE IN THE FBO MY PAX INFORMED ME THE PERSON GOING INTO THE RESTROOM HAD GOTTEN OUT OF THE R FRONT SEAT OF Y. HE HAD A SHIRT AND TIE ON AND I ASSUMED HIM TO BE AN INSTRUCTOR. I COULDN'T CONFIRM THIS AS I WAS STILL BUSY ON THE PHONE WHEN HE LEFT. Y ALSO DEPARTED BEFORE I WAS FINISHED. CTAF AT LSN IS 122.8. SUNDAY WAS A VERY BUSY DAY IN THIS AREA SINCE THERE HAD BEEN SUBSTANTIAL RAIN AND FLOODING IN CENTRAL CALIFORNIA AND THERE WAS A LOT OF SIGHTSEEING GOING ON. Y MAY NOT HAVE HEARD ALL OF MY XMISSIONS DUE TO FREQ CLUTTER. POSSIBLY DUE TO ACCENT/LANGUAGE CONSIDERATIONS; Y DIDN'T UNDERSTAND MY INTENTIONS OR POS RPTS. PERHAPS HE IS A STUDENT PLT WITH POOR ENGLISH AND MINIMAL RADIO TECHNIQUE OR MINIMAL FLYING SKILLS; PER SE. IF; HOWEVER; THIS WAS A STUDENT WITH AN INSTRUCTOR; IT IS INEXCUSABLE FOR THE INSTRUCTOR NOT TO HAVE TAKEN OVER AT SOME POINT BEFORE SAFETY WAS COMPROMISED. TO HAVE TAXIED PAST ANOTHER AIRPLANE ONTO THE ACTIVE RWY WITH A PLANE ON BASE TURNING FINAL WITHOUT VISUAL AND OR RADIO CONTACT WITH THEM IS POOR TECHNIQUE WHICH SHOULD NOT BE CONDONED. IF THE PIC WAS AN INSTRUCTOR TEACHING A STUDENT; SAFE PRACTICES WERE NOT FOLLOWED. I FELT STRONGLY ENOUGH TO RPT THE INCIDENT TO THE FSS SUPVR AFTER I GOT HOME; AND INTEND TO FOLLOW IT UP WITH THE FSDO IN THE MORNING. THIS IS THE FIRST TIME I HAVE RPTED AN INCIDENT TO FLT SVC BUT THE SECOND NASA RPT I HAVE MADE. I ENJOY YOUR CONTRIBUTION TO SAFE FLT AS WELL AS YOUR PUBLICATION. KEEP UP THE GOOD WORK.