  We derive the kinetic equation for fermions and antifermions interacting with
a planar Higgs bubble wall during the electroweak phase transition using the
`evenisation' procedure. Equations of motion in a relativistic quantum theory
do not mirror classical relations unless one uses evenised operators. We give a
brief introduction to evenisation and then use the evenised Heisenberg
equations of motion to obtain the velocity and force for the particles in the
presence of the Higgs bubble wall. Keeping quantum contributions to $O(\hbar)$
in the equations of motion we obtain the semi-classical force obtained earlier
by other techniques.
