Partial conservation of axial current (PCAC) relating the interactions of neutrinos and pions, might look as a manifestation of the pion dominance. However, neutrinos do not fuctuate to pions because of conservation of the lepton current, but interact via much heavier hadronie components. This fact leads to nontrivial relations between diagonal and off-diagonal diffractive interactions of pions. Absorptive corrections break these relations for any target at any anergy.