Filament eruption and flare ribbon seen in Hα – 0.8 Å. The white arrow at 15:51 UT marks the ribbon associated with the surge-like event in the footpoint of the filament. The black arrows indicate the rising twisted flux-ropes of the filament. The white box at 16:09 UT denotes the region used to produce the slice-time images in Fig. 4. The dotted lines at 16:11 UT denote a region that is enlarged in Fig. 8. Contour plots of HMI magnetogram are shown in images at 16:07:11 UT and 16:09:15 UT (yellow: –300 Mx cm^-2, blue: 300 Mx cm^-2).