CORP ACFT GIVEN HDG AND ALT CHANGE FOR SEPARATION HAS LOSS OF ACFT CTL.

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THE CTLR CALLED TFC; GIVING DISTANCE; ALT AND DIRECTION. WE DIDN'T SEE TFC. IT WOULD BE HARD TO SEE AS IT WAS AT A SIMILAR ALT AND DIRECTION. THE CTLR ASKED IF WE HAD THE TFC. WE DIDN'T. THE CTLR GAVE A L HDG CHANGE OF ABOUT 50 DEGS AND AN ALT CHANGE FROM 10000 FT TO 8000 FT MSL. THERE WAS A SENSE OF URGENCY. NORMALLY I WOULD HAVE HAND FLOWN THE AIRPLANE; EXCEPT THE PNF (CHIEF PLT) HAS A TANTRUM ANYTIME A MANEUVER COULD BE CONSIDERED ABRUPT. THERE IS NO CONSIDERATION AS TO WHY; SUCH AS WAKE TURB AVOIDANCE; COMPLYING WITH ATC; OR COLLISION AVOIDANCE. THE PNF TOOK THE AIRPLANE; TURNING L AND STARING DOWN. THERE WAS NO VERBAL COM. THE NOSE WAS PUSHED DOWN ABRUPTLY ENOUGH SO THAT THE PAX NOTICED. AT ABOUT 8500 FT I NOTICED THE ACFT'S NOSE PITCHING UP WITH A CLB TO; I BELIEVE; 10300 FT. THE OTHER PLT STARTED YELLING FOR 'TRIM;' SAYING HE COULDN'T REACH THE TRIM BUTTON; WHILE PUSHING FORWARD ON THE WHEEL. AS THE AIRSPD DECREASED HE REGAINED CTL. AT THIS POINT I WAS GIVEN THE AIRPLANE WITHOUT VERBAL COM. HE RAN OUT OF ELEVATOR CTL BECAUSE THE ACFT WAS OUT OF TRIM OR TRIMMED IMPROPERLY. I DID NOTICE THE TRIM WAS CLOSER TO THE GREEN TKOF MARKING THAN THE FULL NOSE DOWN TRIM RED MARK. THE OTHER PLT DID SEE THE OTHER ACFT PASS TO OUR R AFTER WE HAD CLBED BACK TO OUR ORIGINAL ALT. WHY DID THIS HAPPEN? THE CHIEF PLT DIDN'T MAINTAIN CTL OF THE ACFT. SECOND; THE CHIEF PLT IS A POOR LEADER AND HAS AN UNSTABLE PERSONALITY. HE DISCOURAGES INPUT WITH HIS TEMPER AND JUMPING TO CONCLUSIONS. HIS POOR SELF IMAGE IS COMPENSATED FOR BY EXCESSIVE ASSERTIVENESS. THE NET RESULT IS I AM NOT ASSERTIVE ENOUGH WHILE BALANCING SAFETY AND JOB SECURITY. THE NEXT MORNING THE CHIEF PLT APOLOGIZED FOR OVER REACTING.