First jet-like activity. (a1)–(a3): 304 Å images observed by SDO/AIA. The dotted white and black lines outline the twisted structures. (b1)–(b3): 193 Å images observed by SDO/AIA. The subgraphs in panels a1 and b2 are the corresponding images at around 06:03 UT. The white box in panel b1 outlines the FOV of these two subgraphs. (c1)–(c3): line-of-sight magnetic magnetograms from SDO/HMI. The yellow and blue contours indicate the positive and negative magnetic fields with the levels of ±100 G, respectively. The black box in panel c2 outlines the region of the magnetic flux in Fig. 2c. An animation available online shows the first jet-like activity in the 304 and 193 Å wavelengths during the period from 05:55 UT to 06:18 UT.