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We present an analysis of the spectator mechanism of $\Delta $-isobarproduction in the pion photoproduction on nuclei with the emission of twonucleons. The reaction mechanism is studied within the framework of the $\DeltaN$-correlation model, which considers the isobar and nucleon of the $\DeltaN$-system produced in the nucleus at the virtual $NN \to \Delta N$ transition,to be in a dynamic relationship. The two-particle transition operator fornuclei is obtained by the \textit{S}-matrix approach. We consider theproperties of the spectator mechanism of isobar production using the example ofthe reaction $^{16}$O$ (\gamma ,\ \pi ^{ - }pn)^{14}$O. Numerical estimates ofthe cross section are obtained in the kinematic region, where it is possible toexpect the manifestation of bound isobar-nuclear states.

Spectator isobar production in the $A\left( {\gamma ,\pi NN} \right)B$ reaction