Side view of the magnetic topology from NFFF extrapolations before the flare (top at 07:00 UT and bottom at 08:00 UT). The lower boundary shows photospheric HMI B_z (±1000 G). The field lines are colored by J/B in units of pix⁻¹; the red highlighting indicates possible reconnection sites. The yellow area indicates the location of the localized heating P1 observed with TRIPPLE-SP.