Quasistationary quaternionic Hamiltonians and complex stochastic maps

We show that the complex projections of time-dependent $\eta $-quasianti-Hermitian quaternionic Hamiltonian dynamics are complex stochastic dynamics in the space of complex quasi-Hermitian density matrices if and only if a quasistationarity condition is fulfilled, i. e., if and only if $\eta $ is an Hermitian positive time-independent complex operator. An example is also discussed.