  We argue on a continuous (dynamical) kinetic freeze-out of $K^\pm, \phi$
observed at midrapidity in collisions Au(1.23 A GeV) + Au. The simulations by
means of a transport model of BUU type point to time independent transverse
momentum slope parameters after 20 fm/c. The complex interplay of expansion
dynamics and strangeness production/exchange/absorption as well as elastic
scatterings involved in the reaction network does not support the previous
interpretation of a late freeze-out of $K^-$ due to larger cross sections.
