  We discuss the importance of Fe$^{23+}$ in determining the line intensities
of the Fe XXV K$\alpha$ complex in an optically thick cloud, and investigate
the prediction of Liedahl (2005) on Resonance Auger Destruction (RAD) with
CLOUDY. Although initially motivated by the Perseus cluster, our calculations
are extended to the wide range of column densities encountered in astronomy. A
Fe XXV line photon can change/lose its identity upon absorption by
three-electron iron as a result of "line interlocking". This may lead to the
autoionization of the absorbing ion, ultimately destroying the Fe XXV K$\alpha$
photon by RAD. Out of the four members in the Fe XXV K$\alpha$ complex, a
significant fraction of the x line photons is absorbed by Fe$^{23+}$ and
destroyed, causing the x line intensity to decrease. For example, at a hydrogen
column density of 10$^{25}$ cm$^{-2}$, $\sim$ 32\% of x photons are destroyed
due to RAD while w is mostly unaffected. The line intensity of y is slightly
($\leq$2\%) reduced. z is not directly affected by RAD, but the contrasting
behavior between z and x line intensities points towards the possible
conversion of a tiny fraction ($\sim$ 2\%) of x photons into z photons. The
change in line intensities due to Electron Scattering Escape (ESE) off fast
thermal electrons is also discussed.
