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tokens: The authors thank S. Gunar, B. Gelly, and the team of THEMIS for assisting with the observations. We would like to thank Jean-Marie Malherbe and Thierry Roudier whoco-aligned the SOT frames. They tested, up to now unsuccessfully, the CST and LCT methods to derive the flow pattern in the plane of the sky. We thank J. Dudik who provided the time-distance code to track the knots in the SOT cube of data, and G. Aulanier and P. Démoulin for fruitful discussions. This paper was discussed during the ISSI workshop (PI N. Labrosse) on “Solving the prominence paradox”. P.J.L. acknowledges support from an STFC Research Studentship. N.L. acknowledges support from STFC grant ST/I001808/1. Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway). IRIS is a NASA small explorer mission developed and operated by LMSAL with mission operations executed at NASA Ames Research Centre, and major contributions to downlink communications funded by the Norwegian Space Center (NSC, Norway) through an ESA PRODEX contract. The AIA data are provided courtesy of NASA/ SDO and the AIA science team. M.Z. acknowledges support from the project RVO:67985815 of the Czech Academy of Sciences.