  At the filling factor $\nu=2$ the bilayer quantum Hall system has three
phases, the ferromagnetic phase (spin phase), the spin singlet phase (ppin
phase) and the canted antiferromagnetic phase. We analyze soft waves and
quasiparticle excitations in the spin and ppin phases. It is shown that the
dynamic field is the Grassmannian G$_{4,2}$ field carrying four complex degrees
of freedom. In each phase there are four complex soft waves (pseudo-Goldstone
modes) and one kind of skyrmion excitations (G$_{4,2}$ skyrmions) flipping
either spins or pseudospins coherently. An intriguing property is that a
quasiparticle is a G$_{4,2}$ skyrmion essentially consisting of two CP$^{3}$
skyrmions and thus possesses charge $2e$.
