LAX MULTIPLE RWY OP PARALLEL RWYS VISUAL APCH. FOREIGN ACR Y; WDB; NON ADHERENCE TO ATC CLRNC (APCH TO WRONG RWY) HAD NMAC WITH ACR X. PLTDEV. SEE AND AVOID CONCEPT.

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ACR X ON DOWNWIND FROM SMO VOR WE WERE CLRED FOR A VISUAL APCH TO RWY 24R AT LAX. OUR TFC WAS FOREIGN ACR Y WDB; SIDE STEPPING TO LAND ON RWY 24L. WITH THE TFC IN SIGHT I EXECUTED MY APCH TO BE ABEAM AND SLIGHTLY HIGHER THAN THE WDB TO AVOID HIS WAKE TURB. AS I PREPARED TO LAND THE WDB WAS NOT VISIBLE ON MY L BECAUSE A FO CANNOT SEE OUT THE L SIDE OF THE ACFT. APPARENTLY THE WDB DID NOT EXECUTE A PROPER SIDE STEP AND WAS CLOSE ABOARD. I COULD NOT SEE THE SITUATION DEVELOPING ON THE L SIDE OF THE ACFT. THE WDB EXECUTED A MISSED APCH. SUPPLEMENTAL INFO FROM ACN 202744: WE WERE HOLDING SHORT OF RWY 24L; FOR DEP AND ON TWR FREQ; THE CAPT; AND MYSELF OBSERVED OUR COMPANY ACR X OVER THE THRESHOLD OF RWY 24R AT APPROX 150 TO 200 FT AGL IN LNDG CONFIGN AND ABOUT TO FLARE WITH A FOREIGN WDB APPROX 100-150 FT ABOVE AND 200-300 FT BEHIND MIN AT A GREATER SPD. A COLLISION LOOKED ABOUT TO HAPPEN! THE TWR CTLR WAS IN WHAT SEEMED A NORMAL VOICE WAS ASKING THE WDB IF HE HAD RWY 24L IN SIGHT VISUALLY FOR LNDG. THE RESPONSE WAS WHAT SEEMED AS A VERY STRAINED PERSON IN EITHER BROKEN ENGLISH OR FRACTURE SPEECH. THE WDB AT THIS POINT (ACR X 100 +\- AGL 200 TO 300 DOWN THE RWY AND THE WDB 100 FT ABOVE (DIRECTLY) THE ACR X) APPEARED TO BE ROTATING UP WHILE RETRACTING THE GEAR IN A GAR - THE TWR CTLR STATED 'ACR Y ARE YOU GOING AROUND?' AT THIS POINT THE SEPARATION INCREASED AND THE CONFLICT ENDED - ALL I CAN ADD AT THIS TIME IS THAT FROM WHAT I OBSERVED - THE WDB WAS OBVIOUSLY 'SCREWED UP' BUT IN THE END SAVED A 'MID-AIR' BY THE GAR - AND THAT FROM THE SHORT DURATION OF TWR CONVERSATION WE HEARD. THE CTLR WAS DOING 'NOTHING' TO PREVENT THE NEAR MISS.