  The interaction region of hard exclusive hadron scattering can have a large
transverse size due to endpoint contributions, where one parton carries most of
the hadron momentum. The endpoint region is enhanced and can dominate in
processes involving multiple scattering and quark helicity flip. The endpoint
Fock states have perturbatively short lifetimes and scatter softly in the
target. We give plausible arguments that endpoint contributions can explain the
apparent absence of color transparency in fixed angle exclusive scattering and
the dimensional scaling of transverse rho photoproduction at high momentum
transfer, which requires quark helicity flip. We also present a quantitative
estimate of Sudakov effects.
