ACR Y TCASII RA CLB THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. EVASIVE ACTION TAKEN BY ACR X.

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WHILE WORKING AS A CTLR ON THE TAR-H POS AT ATL; I HAD A TIME ARR; ACR X. THIS ACFT WAS GIVEN RWY 27L FOR ARR TO CROSS TIROE AT OR BELOW 14000 FT DSND AND MAINTAIN 12000 FT. ACR X WAS LATER DSNDED TO 11000 FT. ANOTHER ACFT DEPARTING ATL; ACR Y; WAS CLBED TO 10000 FT BY THE CTLR WORKING THE DEP RADAR S POS. THE CLBING ACFT RESPONDED TO A TCASII ALERT TO CLB RESULTING IN THE LOSS OF SEPARATION. X RESPONDED THAT HE WAS ON A 030 DEG HDG AND THAT WAS CLOSE WITH THE DEP. WHEN THE CONFLICT ALERT SOUNDED THE DEPARTING ACFT'S MODE C INDICATED 10600 FT AND THE TARGETS MERGED. THE DATA BLOCKS WERE ALSO OVERLAPPING ON THE CONFLICT ALERT. TFC AT THIS TIME WAS HVY DURING THE INBOUND PUSH. X LANDED AT ATL AND THE DEP Y CONTINUED TO SAV. THIS TYPE OF TCASII RESPONSE FOR THE DEP TO CLB ABOVE 10000 FT CREATED A VERY CLOSE SIT AND MADE ME VERY TENSE VERY QUICKLY. FROM THE TIME OF THE CONFLICT ALERT THERE WAS NOT ANY TIME FOR ME TO ASSIST AS A CTLR. SUPPLEMENTAL INFO FROM ACN 264636: ACR X LEVEL AT 11000 FT ASSIGNED ON 030 DEG HDG FOR VECTORS TO DOWNWIND LEG LNDG RWY 27L AT ATL. POS WAS 7-10 MI SW OF ATL VORTAC. RECEIVED A TCASII RA GENERATED BY AN ACFT (MD88) CLBING THROUGH HIS ASSIGNED ALT OF 10000 FT. WE ACQUIRED HIM VISUALLY AND EXPECTED HIS RA TO BE A NUISANCE RA SINCE THIS IS A COMMON OCCURRENCE BTWN INBOUNDS LEVEL AT 11000 FT AND CLBOUTS LEVELING AT 10000 FT. WHEN IT BECAME APPARENT THAT HE WAS NOT LEVELING AND CONTINUED TO CLB THROUGH OUR ALT; WE TOOK EVASIVE ACTION BY TURNING L ABOUT 30 DEGS OF HDG CHANGE. CPA WAS APPROX 1/2 MI. WE ELECTED NOT TO FOLLOW THE RA COMMAND DUE TO POTENTIAL TFC CONFLICTS WITH ADDITIONAL TFC BELOW THE RA TARGET CLBING OUT ON DEP FROM ATL. A HORIZ ESCAPE MANEUVER WAS THE SAFER COURSE OF ACTION IN THIS INSTANCE.