  The scaling of the relativistic reconnection outflow speed is studied in the
presence of both shear flows parallel to the reconnecting magnetic fields and
guide fields pointing out of the reconnection plane. In nonrelativistic
reconnection, super-Alfv\'enic shear flows have been found to suppress
reconnection. We extend the analytical model of this phenomenon to the
relativistic regime and find similar behavior, which is confirmed by
particle-in-cell simulations. Unlike the nonrelativistic limit, the addition of
a guide field lowers the in-plane Alfv\'en velocity, contributing to slower
outflow jets and the more efficient suppression of reconnection in strongly
magnetized plasmas.
