is attack on titan (shingeki no kyojin) episode 86 filler?

Armin Arlelt watches Daz's body sink into the sea after being shot by Conny Springer. As Conny comes to grips from having killed Samuel Linke-Jackson as well, the battle between the Jaegerists and the Female and Armored Titans rages on throughout the port.

From their shelter, partially below ground, Hange Zoë learns for the first time from one of the Azumabito mechanics that it normally takes them a full day to prepare the flying boat for flight.