A PAX IS UNNERVED BY A TAILPIPE FIRE DURING THE PUSHBACK OP OF A B757-200 AND INITIATES AN EVAC; AGAINST THE COMMANDS OF THE FLT ATTENDANT IN CHARGE AT ZZZ; US.

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I WAS CAPT AND PIC OF FLT. IT WAS CONDUCTED WITHIN NORMAL PARAMETERS THROUGH PUSHBACK IN ZZZ. AFTER THE GND CREW DISCONNECTED THE TUG; WE STARTED #2 ENG. AS IT WAS SPOOLING UP; WE FELT A BUFFET THAT WOULD BE CONSISTENT WITH RECEIVING JETWASH (BLAST) FROM ANOTHER ACFT. SHORTLY THEREAFTER; I OBSERVED THE GND CREW WALKING BACK TOWARD THE TERMINAL. I NOTICED THAT ONE OF THE GND CREW WAS HOLDING HIS ARM UP AND CIRCLING AN EXTENDED FINGER AS IF TO SIGNAL AN ENG START. ANOTHER GND CREW EMPLOYEE LOOKED AT OUR ACFT AND BROUGHT HER HANDS TO HER MOUTH. ALTHOUGH THERE WERE NO ABNORMAL INDICATIONS IN THE COCKPIT; I SHUT DOWN THE #2 ENG. ALMOST IMMEDIATELY AFTER SHUTTING DOWN THE #2 ENG; I RECEIVED A CALL FROM A FLT ATTENDANT WHO WAS POSITIONED IN THE FRONT OF THE CABIN. SHE RPTED 'WE HAVE A FIRE.' I ASKED WHERE THE FIRE WAS. SHE SAID EITHER STANDBY; HOLD ON; OR SOMETHING TO THAT EFFECT. ABOUT THAT TIME; I NOTICED THAT SOME PAX WERE ON THE RAMP AND THAT THE EMER DOOR AND ENTRY DOOR LIGHTS WERE ILLUMINATED. I THEN SHUT DOWN THE #1 ENG. I THEN INSTRUCTED THE FO TO CALL GND CTL AND REQUEST THE DISPATCH OF EMER EQUIP. I MADE A PA AND REQUESTED THAT PAX REMAIN ON THE ACFT. THE FIRE MARSHALL INFORMED ME THAT THERE WAS NO FIRE. WE READ THROUGH THE EVAC CHKLIST. WE THEN CALLED OPS TO BRING OUT STAIRS TO DEBOARD THE CREW AND REMAINING PAX. PRIOR TO DEPARTING ACFT WE WERE BOARDED BY MAINT PERSONNEL AND FIRE MARSHALL. PROB AREAS: GND CREW FAILED TO GIVE ME THE APPROPRIATE HAND SIGNALS FOR AN ENG FIRE. THEY NEED RECURRENT TRAINING. A CERTAIN PAX TOOK IT UPON HIMSELF TO PHYSICALLY PUSH A FLT ATTENDANT ASIDE TO ACTIVATE THE SLIDE FOR AN APPARENT TAILPIPE FIRE AFTER BEING TOLD TO REMAIN IN HIS SEAT! HE SHOULD BE IDENTED AND PROSECUTED.