FLC OF AN MDT OBSERVED ANOTHER ACFT ON A CONVERGING COURSE CHANGE ASSIGNED HDG IN RESPONSE TO THE CLOSE PROX OF THE RPTR'S ACFT IN THE SETTING SUN.

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WE WERE TOLD TO MAINTAIN VISUAL SEPARATION FROM AN ATP ACR Y AIRLINER TURBOPROP ON OUR CLBOUT. AS WE PASSED THROUGH THEIR ALT; THE OTHER PLANE PASSED BEHIND US BY ABOUT A 1/2 MI. WE CLRLY COULD SEE THAT HIS PATH WOULD TAKE HIM BEHIND US (THE CONVERGENT ANGLE WAS SHALLOW; APPROX 30 DEGS); BUT SINCE HE WAS LOOKING STRAIGHT INTO THE SETTING SUN IN ORDER TO SEE US; HE WAS NOT CERTAIN THE MANEUVER WAS SAFE. THE OTHER PLT CLRED TO TURN OFF HIS ASSIGNED HDG TO ASSURE SAFE SEPARATION; SINCE HE WAS NOT ABLE TO ADEQUATELY ASSESS THE SIT DUE TO THE SUN. WITH THE SUN DIRECTLY BEHIND US; WE COULD EASILY SEE THAT IT WAS SAFE. THE OTHER PLT EXPRESSED DISSATISFACTION AT 'HAVING TO MANEUVER' AROUND US. THIS IS THE MAIN POINT: EVEN THOUGH WE COULD SEE THAT ALL WAS OK; WE COULD HAVE USED EVEN MORE SPACE BTWN US. THE FACT THAT THE OTHER PLTS CHOSE TO MANEUVER AROUND US DEMONSTRATES THAT AN INCREASED MARGIN OF SAFETY WOULD HAVE BEEN PREFERENTIAL. I AM SORRY THAT I CAUSED THE OTHER PLTS TO BE DISTRACTED FROM THEIR DUTIES TO RESPOND TO WHAT THEY PERCEIVED TO BE A THREAT TO THEIR SAFETY.