Explosive Videos from Transformers 4's First Day in Chicago

It seems that Michael Bay decided to give Chicago a Transformers 4 welcome by setting off an impressive series of explosives on the first day of filming in the city. Filmed at the Hyatt Regency McCormick Square, the purpose of the impressive pyrotechnics is now known if you are ok with reading significant spoiler information. The first video is a great aerial view of most of quick sequence while the second and third provide a more ground level perspective. Videos below, gallery of set images here.