is bleach episode 51 filler?

As dawn breaks on the day of Rukia Kuchiki's execution, 10th Division Captain Tōshirō Hitsugaya walks with his lieutenant, Rangiku Matsumoto, while 3rd Division Lieutenant Izuru Kira follows his captain, Gin Ichimaru. At the entrance to the Shishinrō within Senzaikyū, Rukia is escorted out of her cell by members of the Kidō Corps with the same collar used to bring her there.