  Bloom-Gilman duality relates parton distributions to nucleon form factors and
thus constrains the dynamics of exclusive processes. The quark electric charge
dependence implies that exclusive scattering is incoherent on the quarks even
at high momentum transfers. Data on semi-exclusive meson production exceeds the
duality prediction by more than an order of magnitude and violates quark
helicity conservation. This suggests that the subprocess is dominated by soft
`endpoint' contributions which obey dimensional scaling. The large transverse
size of the subprocess may explain the absence of color transparency in fixed
angle processes.
