Ekholm et al. , demonstrated that SF 6 upon ionization follows a single S-F bond dissociation, preserving other five S-F bonds, which reaching 2 Å in the 10 fs time scale. The XE spectrum was found to be significantly dependent on the bond dissociation dynamics, as suggested by simulations reported in Ekholm et.al. . We have additionally carried out an ab-initio molecular dynamics on the |F1s -1 6a 1 1g core-excited state surface, using the MD module implemented in the ORCA package. The dynamics was simulated employed core-excited state from localized F1s orbitals and with a time step of 0.1 fs. The neglect of non-adiabatic effects is motivated by restrictions to a single localized core-hole and excitation into the resonance, which is energetically well-separated from the other resonances. The dynamics on the core-excited state followed very much similar trend of that of the coreionized state. The dynamics is dominated by an ultrafast single S-F bond dissociation, see FIG. . The changes in the other five S-F bond distance are smaller in magnitude. Pyramidalization and angular distortions were also observed but also small in magnitude and only become significant at time-scales much longer than the core-hole life-time. Thus a minimalistic, yet accurate, model to access the effect of excited state dynamics on the RIXS spectrum, especially at the |F1s -1 6a 1 1g resonance, could be achieved by constructing rigid scans along dissociation of a single S-F bond keeping all other modes fixed.