is it possible, that units can move actively away from a creature, that is bound to the group, just for the reason that this creature is then alone, has to be put back in an area in the own town and can support units on this new place?!
So ist it possible to leave the creature alone on a space...the creature would not follow the group.
Specifically, you can't deliberately abandon a creature. The troop that it's with has to be wiped out in battle (or sacrificed to the last unit, or completely destroyed with Rain of Fire) for the creature to go back to its tile.