We study a four-flavor model with unconfined color in the framework of the ${\mathrm{SU}\mathrm{}\left(2\right)\mathrm{}}_L\otimes \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ gauge model. The presence of a color-octet charged current leads to a violation of the universality of the hadronic and leptonic currents; therefore, heavy leptons are needed inevitably to compensate the violation. A condition for cancellation of (84, 1) representation in the combination of current products (15,1)⊗(15,1)+(15,8)⊗(15,8), which explains successfully the observed $\Delta I=\frac{1}{2}$ rule, leads to the result that the slope of the linearly rising cross section $\sigma \left({\nu }_{\mu }\right({\overline{\nu }}_{\mu })N\to {\mu }^{-}({\mu }^{+}\left)X\right)$ must be more than twice as large at energies high enough to produce the color-octet states as it is at lower energies, even if the effects of the weak boson and heavy leptons are taken into account.

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