is attack on titan (shingeki no kyojin) episode 45 filler?

The Scouts pursue the Anti-Personnel Control Squad through the Underground Chapel only to encounter the net the Interior Police had dropped during their retreat. On the other side, the Anti-Personnel Squad prepares for their last stand.

However, the bright light from a Titan transformation shines from the back of the cavern, drawing the attention of Scout and MP alike. Rod Reiss's transformation to a gargantuan Titan begins to cause the cavern to collapse.

It is so large that there is not enough room for it to stand.