Continued defensive post assaults?

[Grognard Gunny]

Here's one I ran across: The enemy has been defeated in an assault, has decided to call it a day, backs off his one hex and has been marked with a Fired/Moved marker. So far, so good.

However, this enemy group is again assaulted by another group of friendlies who are not marked with a Moved/Fired marker, as well it should be. (Not against the rules AND makes sense!).

The question comes in as to whether or not that enemy stack can counterassault even though it has been marked with a Moved/Fired marker already.

Reality says it should be able to..... but at a cost (I would think).

Is this a situation where the Moved/Fired marker is ignored? (For sake of simplicity in the ruleset.) Or is it case where a +1 should be added to the list of modifiers under the guise that suffering ANOTHER assault would cause some degree of discomfort to the receivers.

Whaddya think?

GG