  In heavy quark production at large Feynman $x$ there are two hardness scales,
one given by the heavy quark pair mass $\M^2$\ and the other by
$\Lambda_{QCD}^2/(1-x)$. When these two scales are comparable, the twist
expansion of Perturbative QCD breaks down. We discuss the dynamics in this new
QCD limit, where $\mu^2=\M^2(1-x)$ is held fixed as $\M^2\to \infty$. New
diagrams are found to contribute, which can enhance the cross section above
that expected for leading twist. The heavy quarks are produced by a peripheral
scattering on the target of hardness $\mu^2$. This leads, in particular, to a
nuclear target dependence of $A^{2/3}$ at small $\mu$. Qualitatively, the
dynamics in the new limit agrees with earlier phenomenological models of
``intrinsic'' heavy quark production.
