AN ACR MLG CLBED IN RESPONSE TO A TCASII COMMAND. 2 FLT ATTENDANTS WERE THROWN ABOUT WITH NO INJURY.

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I HEARD THE TCASII SAY 'CLB; CLB.' I LOOKED AT THE VSI AND SAW THE GREEN 'FLY TO LIGHTS' SHOWING AT 2000-2300 FPM. I THEN LOOKED AT THE TCASII SCREEN ON THE CTR PEDESTAL AND THE RED INTRUDER BOX COLOCATED OVER THE MINIATURE AIRPLANE OF THE TCASII SCREEN (THE RELATIVE ALT OF THE INTRUDER ACFT WAS OVERWRITTEN BY THE MINIATURE AIRPLANE OF THE TCASII SCREEN; I THINK THE RANGE WAS 40 OR 20 NM. I WAS THEREFORE UNABLE TO TELL HOW CLOSE WE WERE.) BY THIS TIME; THE CAPT (AND PF) DID NOT RESPOND YET TO THE RA. THE AUTOPLT WAS ENGAGED. I HAD APPLIED A SLIGHT AMOUNT OF BACK PRESSURE TO THE CTL AND THEN DISENGAGED THE AUTOPLT AND CONTINUED FIRMLY PULLING BACK ON THE CTL. THE CAPT THEN CALLED OUT 'I'VE GOT IT.' HE LEVELED OFF 29500 FT (500 FT CLB). I THEN TOLD CTR WE WERE RESPONDING TO TCASII. CTR THEN QUESTIONED THE OTHER ACFT 'ARE YOU LEVEL FL280.' THE FLT ATTENDANT THEN CAME IN THE COCKPIT AND SAID ONE FLT ATTENDANT WAS KNOCKED TO THE FLOOR AND ANOTHER FELL INTO A PAX SEAT. NO ONE WAS HURT. (THIS WAS DUE TO EITHER THE JERK OF THE AUTOPLT BEING DISENGAGED; OR THE G FORCE OF THE INITIAL CLB.) A DISCUSSION WITH THE CAPT AFTER THE INCIDENT REVEALED FROM HIS PERSPECTIVE: HE INITIALLY HEARD 'TFC; FOR JUST A SPLIT SECOND BEFORE THE CLB RA. HE SAW THE TFC ON TCASII SHOWING 800 FT BELOW US AT ONE POINT. HE HAD A VISUAL ON THE TFC. MAYBE THIS IS WHY HE HESITATED IN RESPONDING. I FIND IT QUITE COMMON FOR CAPTS NOT TO RESPOND AT ALL TO RA'S WHEN THERE IS A VISUAL AND THE RELATIVE ALT IS KNOWN. SUPPLEMENTAL INFO FROM ACN 228398: ADVISORY TCASII DISPLAYED 800 FT SEPARATION BTWN OUR ACFT AND OTHER TFC BELOW. OTHER ACFT MUST HAVE SLIGHT CHANGE IN ALT AT JUST THE RIGHT MOMENT. TFC 12 O'CLOCK TO US 10-20 MI WHEN TCASII GAVE TA ALERT AND WITHIN A FEW SECONDS RA 'CLB.'