  We consider a four-point process, associated with a wide-angle elastic
scattering of two off-mass-shell spin-1/2 matter particles, in a non-abelian
gauge theory. On the basis of a worldline approach, which reverts the
functional to a path-integral description of the system, we factorize an
eikonal (``soft'') subsector of the full theory and calculate the Sudakov-like
suppression factor for the four-point function as a whole, once we have
extracted the associated anomalous dimensions and taken into account the
renormalization-group controlled evolution.
