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It is demonstrated that resistive transition at 203 K observed in metallicsulfur hydride system at high pressure can be magnetic (rather thansuperconducting (SC)) in nature. The onset temperature of genuinesuperconducting transition in these compounds appears to be essentially loweron temperature. The normal-state magnetic (AF SDW) phase transition preceding asuperconducting one (Tc < Tm) is characteristic for HTSC cuprates, pnictides(selenides) and organic superconductors. The resistive drop is provided bydisappearing of magnetic (AF spin fluctuation) scattering of conductionelectrons and hence formation of AF SDW order in the normal state. Theformation of such modulated magnetic structure in sulfur hydride seems to bepossible because of magnetic properties of metallic hydrogen at high densities(in analogy with iron). Such unconventional picture with two successive phasetransitions: magnetic (AF SDW) and only then superconducting one is naturallydescribed by Keldysh-Kopaev theory of dielectric (metal-insulator) phasetransition in systems with coexistence of superconducting (e-e) and dielectric(e-h)pairings.

Comment on "Conventional superconductivity at 203 kelvin at high  pressures in the sulfur hydride system" (A. P. Drozdov et al., Nature 525, 73  (2015))