I think that sometimes spirit and soul seem to be used intechangebly.
We know that the spirit goes back to God/heaven when we die, scripturally that is a given, but the issue of the sould gets some confused.
The OT states that the soul dies, Jesus makes it clear that the soul CAN die, but I don't hink that anywhere is it stated that the soul and spirt can be "apart", I think that you really can't have one without the other, can you?