AN A320 PIC TAKES OVER FROM HIS FO AND PERFORMS A DRAMATIC EVASIVE ACTION CLB FOR OPPOSITE DIRECTION TFC WHEN TCASII RA ORDERS CLB COMMAND. A CABIN ATTENDANT IS INJURED FROM THE PULL UP.

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DURING DSCNT; THE FO WAS THE PF. AT ABOUT 12000 FT ALT; AND 40-50 NM SE OF LBS (DEST ARPT) WHILE I WAS UPDATING ATIS ON COM #2; SOCAL APCH CTL RPTED AN ACR B737 AT 1 O'CLOCK; LOW; OPPOSITE DIRECTION. THE FO MADE VISUAL CONTACT AT THE 2 O'CLOCK POS; MOVING TO 3 O'CLOCK. I NEVER HAD VISUAL CONTACT WITH THE B737. AS I RETURNED TO THE SOCAL FREQ ON COM #1; THE TCASII GAVE AN AURAL TA; AND I NOTED AN AMBER TARGET DISPLAYED AT OUR 4 O'CLOCK POS; LESS THAN 1 MI HORIZ; 700 FT BELOW. THE TA WAS FOLLOWED IMMEDIATELY BY AN RA 'CLB; CLB NOW!' I REACTED BY ADVANCING THE THRUST LEVERS TO TOGA AND APPLYING FULL AFT STICK. ALMOST IMMEDIATELY; AND BEFORE THE ACFT CLBED MORE THAN 100 FT; THE RA WAS REPLACED BY A 'CLR OF CONFLICT' ADVISORY. TOTAL ALT GAIN WAS 150 FT. TIME WISE; THE ENTIRE INCIDENT FROM TA UNTIL CLR OF CONFLICT WAS PROBABLY 5-6 SECONDS. SOCAL WAS ADVISED OF THE RA AND ACTIONS TAKEN. THE CTLR REPLIED THAT THE ACFT IN QUESTION WAS THE B737 PREVIOUSLY RPTED. THE FO RPTED LATER THAT THE B737 APPEARED ALMOST AT OUR ALT AS IT CLOSED; AND ITS RELATIVE POS VISUALLY DID NOT CORRESPOND WITH THE THREAT DISPLAYED BY TCASII. THEREFORE; SINCE HE COULD NOT CONFIRM POSITIVE VISUAL CONTACT WITH THE THREAT; HE ALSO MADE AN ATTEMPT TO CLB IMMEDIATELY. DSCNT TO 8000 FT WAS RESUMED. BEFORE PASSING 10000 FT; HOWEVER; THE FIRST FLT ATTENDANT CAME TO THE FLT DECK TO RPT THAT THE SECOND FLT ATTENDANT HAD BEEN INJURED DURING THE ESCAPE MANEUVER WHEN HE FELL TO THE FLOOR IN THE CABIN AISLEWAY. HE COMPLAINED OF PAIN IN ONE ANKLE. HE WAS ASSISTED TO A PAX SEAT WHERE HE REMAINED UNTIL THE ACFT WAS PARKED. THE SECOND FLT ATTENDANT WAS EXAMINED IN THE TERMINAL BY PARAMEDICS AND TAKEN TO A HOSPITAL. LATER; A NURSE RPTED TO ME BY TELEPHONE THAT FURTHER EXAMINATION AND X-RAY REVEALED NO BREAKS OR FRACTURES. THE ANKLE WAS SPLINTED AND THE FLT ATTENDANT WAS RELEASED ON CRUTCHES. AFTER LNDG; I NOTIFIED SYS OPS CTL AND DISCUSSED THE INCIDENT WITH MAINT CTL AND A REPRESENTATIVE OF ALPA. THE FO AND I ALSO PROCEEDED TO A LCL URGENT CARE CTR FOR DRUG TESTING ON THE ADVICE OF THE COMPANY CHIEF PLT. IT IS MY OPINION THAT THE ACFT SYS (TCASII AND FLT CTLS) WORKED AS STATED IN THE FCOM; AND NO APPARENT MALFUNCTIONS WERE NOTED. THE ACFT WAS SUBSEQUENTLY RELEASED BY THE NTSB AND MAINT CTL FOR THE RETURN FLT TO PHOENIX.