Shingeki no Kyojin Episode 20: Erwin Smith: 57th Expedition Beyond the Walls, Part 4

info: MAL/wiki/AniDB

"With the Female Titan restrained, Erwin and Levi try to figure out its identity with no success as it is able to harden its skin to prevent them from cutting out the human inside. Jean, Armin, and the rest of Levi's squad realize it was Erwin's plan to use Eren as bait..."

Damn, that was interesting. Wonder who is wearing that cape?