Reconstruction of the magnetospheric magnetic field using swarms of synthetic probes provided by data mining confirms seminal in-situ evidence (Angelopoulos et al., 2008) that on February 26, 2008 an X-line emerged in the region between two distant THEMIS probes at the moment of the substorm activation in the magnetotail. It also shows that the X-line formation was preceded by a rapid current decay. The current was built up earthward of the pre-existing X-line formed prior to the previous substorm activation. The most pronounced effect of the tail reconfiguration at the moments of two substorm activations and the current disruption is the rapid earthward redistribution of the magnetic flux. Comparison of low-altitude mapping of the magnetotail structure with all-sky images suggests that these rapid reconfigurations were triggered by plasma flows whose source is much farther from the Earth than the resolved X-lines.