Hα line center observations of the AR NOAA 12736 with the NVST telescope for four times before (a-d) and one after (f) the surge extension. In panel a, the cyan oval encircles the emerging flux EMF2 like in Fig. 1 which corresponds to a dome (see Sect. 3.2.1), the green circle indicates the bipole P1-N2, the black circle the bipole JP1-JN2. In panel b, we highlight the two systems of AFS (AFS1 and AFS2), with the white arrows indicating long AFS overlying both AFS1 and AFS2 structures. In panel c, we see a dark blob in the middle of the brightening. In panel d the “X” point is indicated where the reconnection occurs. In panel e, the white, more or less horizontal material represents the beginning of the surge ejection with some knots. In panel f, we again see the long AFS. We have accurately rotated the data provided by the NVST team to make them comparable with the AIA and IRIS observations. The image size is 65″ × 65″.