Technically, take a look at the picture above. They (2 groups of agents) are only separated by transformation space but not solver space. Because Miarmy take local coordinate to solve, the 2 groups of agents may affect each other even not in same world position. (Different world positions maybe the same local position)
To separate them totally and never affect each other, we need solver space node. Later, we will talk about the solver space more detail.
creating solver space splitter
solver space node
The pictures above show the different parenting scheme. The left shows agents separated by transformation space, whereas the right one shows agents separated not only by transformation space but solver space.