is bleach episode 91 filler?

In one of the caverns within the Bount capital, Orihime Inoue kneels beside an injured 10th Division Lieutenant Rangiku Matsumoto, who is lying on the ground next to a resting Rukia Kuchiki, and uses Sōten Kisshun to heal her while Yasutora Sado, Kon, Ririn, Kurōdo, and Noba watch anxiously nearby. Upon hearing a booming noise in the distance, Ririn wonders what it could be, prompting Kurōdo to note that it came from the back and must be the result of Ichigo Kurosaki and the others engaging in a fierce battle.