Slit-reconstructed GRIS images at 09:00:56 UT on 2015 April 17 of the EFR centered on the pore P₁ with negative polarity shown in Fig. 1: continuum intensity, line core intensity of the red component of the He I triplet, equivalent width, and He I Doppler velocity calculated assuming only a single flow component (top to bottom). The blue filled circle (second panel from top) refers to the location of strong downflows near the pore P₂, and it is used to calculate the average profiles in Fig. 6. The contours encompass dual-flow He I profiles. The red vertical lines indicate positions of the space-time diagrams (the right line corresponds to the upper panel of Fig. 10). The temporal evolution of the He I line depression and Doppler shifts is available as an online movie covering the period between 08:16:57 UT and 09:18:33 UT.