So, what might "usually" happen?
1. Can a unit just move out of a melee situation? I guess it would then be subject to Op Fire from the unit it was with (as well as any other as usual).
2. Neither can fire out of the hex and by staying together they're setting themselves up for another rout/melee so if that was the desire of both sides, they would be marked as "Used" without doing anything (chose not to move, can't fire and Op Fire must be invalid since they can't fire out of the hex).
3. Maybe another unit of each side moves into the hex during the turn.
2. If both units stay in the same hex then the rout and melee rules will kick in again at the end of the turn.
Does that sound about right?
FWIW the rules are not 100% fresh in my memory, but that all sounds about right to me.