A focus on the filament eruption as seen from Hinode/EIS. (a) A frame from a movie showing the evolution of the EIS He II 256.32 Å line, and (b) the AIA 304 Å emission at 13:23 UT. A square-root intensity scaling is used for the EIS images. Two vertical blue lines on the AIA images show the location of the EIS slit. The movie (between 13:07 UT and 13:27 UT) is available online and at https://owncloud.ias.u-psud.fr/index.php/s/z86YZGWM9jZtAcL. (c,d) Diagrams summarising the interpretations of the observations, in particular the unwinding motion of the magnetic flux rope supporting the filament.