Tana vs Greens
This looks like Darlene Tana is seeking an injunction to stop the Greens from using the waka jumping law to remove her as an MP.
It will be a very interesting case, as there will be arguments over how you determine if proportionality is upset. However I would be very surprised if a judge tries to second guess the decision of a party caucus on the issue, so I do not expect Tana will prevail.
It is possible though she could gain an interim injunction, so the law can’t be triggered until there is a hearing on the merits.