Total flux within the region of the strongest upflow and its vicinity (highlighted by a black box in Fig. 2) starting with a strong positive polarity patch at the south-west edge and weak negative polarity at 07:59 UT. We see three time periods where the total negative flux gets stronger by more than a factor of two (08:05 UT, 08:20 UT, 08:37 UT) and then gets cancelled out by the approaching positive polarity (08:15 UT, 08:32 UT, 08:40 UT). The third such time period coincides with the time when Hinode/EIS observes the upflow (highlighted by red lines). Towards the end, the negative polarity mostly disappears and only smaller remnants are left.