is bleach episode 139 filler?

In the air above Karakura Town, having confronted Grimmjow Jaegerjaquez, Ichigo Kurosaki pulls his hand down in front of his face to summon his Hollow mask in an explosion of red-black Reiatsu. When a shocked Grimmjow demands to know what this is, Ichigo asserts that he does not have time to explain and rapidly moves to Grimmjow with Shunpo before attacking him with Reiatsu trailing off his blade in a powerful slash that Grimmjow barely draws his Zanpakutō in time to block.