B757 CABIN CREW HAS PAX STANDING DURING TAXI; ACFT RETURNS TO THE GATE.

Narrative

THE FLT WAS SUPPOSED TO DEPART AT XA06. AGENTS STOPPED BOARDING. I WAS IN THE BACK AND ONLY FOUND OUT WHEN #2 FLT ATTENDANT TOLD ME AT ABOUT XA00 THAT THERE WAS A PROB. THE CAPT DID NOT MAKE ANY ANNOUNCEMENTS FOR 2 HRS. ONLY FLT ATTENDANT #2 MADE A FEW THAT CAPT IS DOING MAINT CHKS. FINALLY AFTER ALMOST 2 HRS THEY 'THREW' THE REST OF THE PEOPLE ON BOARD AND WE STARTED PUSHING BACK. I CALLED #1 FLT ATTENDANT AND TOLD HER THAT THERE WERE PEOPLE STANDING IN THE AISLES; OVERHEAD BINS OPEN; LUGGAGE ON THE FLOOR. 'WE ARE NOT READY.' WE STOPPED PUSHING BACK TILL EVERYBODY WAS SEATED AND CABIN READY. WHEN THE GND PWR GOT DISCONNECTED; THE ACFT LOST PWR COMPLETELY FOR ABOUT 30 SECONDS. THAT WAS ENOUGH FOR PAX TO GET VERY UNEASY AND SCARED. THE EXIT SIGNS AND EMER LIGHTS CAME ON. WHEN WE STARTED FORWARD ON OUR OWN PWR; A PAX CAME TO THE BACK GALLEY AND TOLD ME YELLING; HE WANTED TO GET OFF; WANTED HIS LUGGAGE (WAS POINTING TO THE MEAL CARTS) AND SAID HE WANTED OUT; POINTING TO THE 4L EXIT DOOR. I TOLD HIM HE HAD TO SIT DOWN TWICE -- THE SECOND TIME IN A RAISED VOICE. HE ONLY SAT DOWN ON HIS ARM REST; HIS CARRY-ON IN HIS LAP. WE KEPT MOVING FORWARD. I CALLED #1 FLT ATTENDANT; TOLD HER ABOUT THE SITUATION THEN CAPT MADE 2 PA'S THAT PAX SHOULD BE SEATED. THE MAN WAS NON COMPLIANT AND EVEN STARTED WALKING TO THE FRONT OF THE ACFT. I CALLED THE COCKPIT -- NO ANSWER. THEN I WAS REALLY AFRAID WE WOULD TAKE OFF AND THE SITUATION WOULD ESCALATE TO SOMETHING REALLY BAD. THEN I HEARD CAPT'S PA THAT WE WERE GOING BACK TO THE GATE AND AUTHS WERE MEETING THE ACFT. IN THE BACK OF THE ACFT PEOPLE STARTED PANICKING -- KIDS WERE CRYING. NOBODY KNEW WHY WE WERE 2 HRS LATE. WHEN WE WERE WAITING FOR THE LUGGAGE TO BE REMOVED; THE CAPT MADE AN EXPLANATORY PA ABOUT THE DELAY.