is bleach episode 28 filler?

As he runs through an alley in the Seireitei, Ichigo Kurosaki wonders where Ganju Shiba ran off to and recalls how he is being pursued by 11th Division 5th Seat Yumichika Ayasegawa, whom Ichigo knows is the fifth strongest member of the division despite not being able to properly remember his face, as he notes that he will probably need to rescue Ganju due to the latter being outclassed. Expressing frustration at how all of the areas he has run through look the same, Ichigo comes to a halt and inhales deeply before loudly demanding to know where Ganju is and instructing him to set off a firework so Ichigo can reach his location.