IRIS SJI 1400 and spectral-slit images while the IRIS slit scans the eruption region (shown from left to right). The red and blue contours trace magnetic fluxes at ±50 G. The Mg II k 2796 Å, C II 1335 Å, and Si IV 1394 Å intensity along the IRIS slit are recorded at the times of the IRIS SJI images and at the location seen at the projected IRIS slit on the SJIs. The C II and Si IV spectral-slit images are shown in a reversed colour table. The location between the black horizontal lines is where the mini-filament is recorded, while the part along the slit between the white horizontal lines is the reconnection site area.