  The Gross-Neveu model with ${\rm U}_L(N_f)\times{\rm U}_R(N_f)$ chiral
symmetry is reconsidered in the large $N_c$ limit. The known analytical
solution for the time dependent interaction of any number of twisted kinks and
breathers is cast into a more revealing form. The ($x,t$)-dependent factors are
isolated from constant coefficients and twist matrices. These latter generalize
the twist phases of the single flavor model. The crucial tool is an identity
for the inverse of a sum of two square matrices, derived from the known formula
for the determinant of such a sum.
