is bleach episode 307 filler?

Gin leaves behind a defeated Lieutenant Rangiku Matsumoto and heads back to Aizen's location. As he does this, he notes that Aizen is still chasing after the people of Karakura Town and remarks on Aizen's cruelty.

Meanwhile, the fleeing Humans find Mizuiro Kojima and Chizuru Honshō cowering in an alley. Tatsuki Arisawa is surprised to find them awake.

Keigo Asano informs her that Mizuiro's phone battery died and Mizuiro apologizes, but says he took a charger from a convenience store. Tatsuki implies that he basically stole it, but he reminds her it was an emergency and claims he couldn't make the clerk wake up.