The key point is that an FA punishment and a civil claim are not the same thing.
For Marinakis, the decision to keep pushing appears to underline how seriously he views the episode. For Palace, it means an issue that might have been treated as closed by the football authorities could continue to cast a shadow.
English football has seen plenty of flashpoints between clubs, owners and supporters, but legal action of this type raises the temperature quickly.
The case could also matter beyond these two clubs. If legal routes become more common after sanctions have already been handed down, clubs may start treating similar incidents with even greater caution.
This is an uncomfortable sideshow for Nottingham Forest at a time when the club appears to be shaping its squad for the season ahead. Another report says Forest have signed defender Ousmane Diomande on a long-term deal, a move that points to clear on-pitch priorities even as off-field noise grows louder.
The next step will be whether the legal action develops into a prolonged fight or prompts a quicker resolution. Either way, the story is unlikely to disappear soon - and both Forest and Palace will want the focus back on football as early as possible.