SDO/AIA observations of the composite 137 and 171 Å channels before and during the eruption. Times are shown at the bottom of each panel. The yellow arrow in panel (a) indicates a tilted loop structure, best seen in the 171 (red) Å channel. In panels (b), (c), and (d), one can see a structure (shown by the yellow arrow) in the 131 Å channel that develops and evolves. The loops further expanded in panel (e). In panel (f), one can see that the very top loop bursted and disappeared and the "core" of the first CME moved out of the view. The first CME lifted out at this time. The brightening at the foot points of the tilted loops intensified. The brightening of the foot points continued in panel (g) and a bump, indicated by the yellow arrow, developed. In panel (h), a second "core" was ejected out from the bumpy place identified in panel (g).