Possible scenarios for the hybrid phenomenon. The background grayscale image is the observed HMI magnetogram (same as in Fig. 1b), the yellow shaded region is the UV burst loop feature rooted at footpoints W and E, and the red shaded structure is the overlying chromospheric canopy. RHESSI detected HXR emission in the 3–25 keV range at footpoint W (see Fig. 1). The stars indicate the location of the magnetic energy release (blue: energy release at footpoint W; black: energy release at the loop-top cusp; see Sect. 6 for a discussion).