is attack on titan (shingeki no kyojin) episode 39 filler?

As Kenny prepares to fire his guns at Levi, Levi throws one of his blades at him. Kenny deflects the blade away and fires a retaliatory shot, but Levi manages to avoid getting hit by hiding under his cloak.

Seeing his squad mates dead, Levi makes a hasty getaway from the scene while being chased by Kenny and his squad. On the wagon, Keiji hears gunshots and sees members of Kenny's squad approaching their position.

He tells Eren and Historia to stay in the carriage and speeds up, but their pursuers are already in range.