Board Thread:Manga/@comment-5774380-20160814045452/@comment-5774380-20160814205831

Yeah, in that case it's most likely that it was liquid Titan Serum contained in syringes and they coordinated their transformation. It must be noted that unlike the people of Ragako who were transformed against their will, those Titans were probably Hometown warriors who injected themselves willingly; unless Zeke somehow kidnapped those many people during his brief visit to Wall Rose three months before and transported them to Shiganshina. There were no reports of mass kidnappings before the expedition, and the only people missing were the people of Ragako, who were confirmed to be all dead (minus Connie's mother) when the number of Titan corpses matched the number of inhabitants.