The counter-battery fire uses radar to calculate where incoming shells are fired from and shoots at that point.
But now the original artillery tries to move away from that point before the counter fire hits it.
That counter fire isn't laser guided.
Is the counter-fire mobile as well? Has it moved from its original point of counter-fire?
If not, there's only a couple rounds of this before counter-fire ends.
Or the counter-fire is protected by a C-RAM system like Phalanx, Iron Dome, MANTIS, or Porcupine/DRACO.
Every counter has a counter. It's turtles all the way down.