You and Reiner were close friends, almost best friends. You didn't know about him being the Armour titan and your other friend, Bertholdt, being the Colossal titan..

You, a select few members of the Survey Corps, Reiner, and Bertholdt were walking along the top of Wall Rose. You were talking to Reiner when suddenly he went on this rant about his hometown and you noticed Bertholdt was starting to get nervous.