is attack on titan (shingeki no kyojin) episode 13 filler?

The elite soldiers continue to lead the struggle to defend Eren. However, Rico's squad, excluding Rico herself, is completely wiped out in the battle, leaving only her and one female soldier.

As they are forced to retreat to the boulder's location, they witness the arrival of more Titans heading their way. At this time, Jean is attempting to take a dead soldier's omni-directional mobility gear as his own one broke, while being watched from top of the Wall by Annie, Conny and now Marco as well.

Having trouble with their gear, Jean is approached by a Titan.