is attack on titan (shingeki no kyojin) episode 22 filler?

As Levi questions whether Eren is dead, Mikasa assures him of the opposite. She explains that the target appears to be intelligent and its purpose was to capture Eren the whole time.

However, Levi states that its goal may have been to eat Eren, so it would be more reasonable to assume Eren's death. Mikasa returns the favor and blames Levi for not doing his job properly, who then recalls that Mikasa is Eren's close friend.

Afterward, Levi states their only goal was to be saving Eren and warns Mikasa not to try to kill the Female Titan.