Moving window hit the obstacle - possible ???

[DanRRRR]

Here are typical setup of laser propagating in the moving window. The moving window permanently with the speed window_v_x and adds new cells at bc_x_max boundary with the same parameters like were already set initially and also removes cells from simulation at bc_x_min boundary. This way laser pulse and accelerated particles moving in the same formally infinite medium. But is it possible that at the predefined time this will stop and laser and particles get out of this medium and hit some plasma with different parameters, some opaque obstacle, solid material etc?

begin:boundaries
  bc_x_min = simple_laser
  bc_x_max = open
  bc_y_min = open
  bc_y_max = open
end:boundaries

begin:window
  move_window = T
  window_v_x = 3.0e8
  window_start_time = 200.0e-15
  bc_x_min_after_move = simple_outflow
  bc_x_max_after_move = simple_outflow
end:window

begin:laser
  boundary = x_min
  intensity_w_cm2 = 1.e20
  lambda = lambda0
  t_profile = gauss ( time , 0.5 * t_fw01m , wt )
  profile = gauss (y ,0 , wy )  
end:laser