  We study the evolution of the Knudsen and Reynolds numbers in
(0+1)-dimensionally expanding fluids with Bjorken symmetry for systems whose
microscopic mean free path rises more quickly with time than usually assumed.
This allows us to explore within a simple 1-dimensional model the transition
from initially thermalizing to ultimately decoupling dynamics. In all cases
studied the dynamics is found to be controlled by hydrodynamic attractors for
both the Knudsen and Reynolds numbers whose trajectories undergo characteristic
changes as the dynamics changes from thermalizing to decoupling.
