Upon discovering a Titan hidden inside the Wall, Pastor Nick desperately requests that Squad Leader Hanji Zoe cover it before sunlight can make it active. Questions arise... questions to which humanity may not be ready to hear the answers.
Turn on CC for English subtitles, most of which are the best guesses of yours truly, based on the manga (Chapter 34: Warriors Dance)
Video courtesy of a French anon poster on 4Chan /a/.
Shingeki no Kyojin belongs to Hanjime Isayama. The anime belongs to Funimation and WIT Studios.
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I heard that this might've been shown at the end of the second recap movie, but here we have...