From my Indy Week link (better than N&O one at time of posting), the Judge Collins made two points:
1 - whole legislature is not invalid, but “enough” is invalid that any action requiring more than the invalid margin may be invalid *
2 - the judicial branch is the correct check on the legislative branch
He cited a US supreme case for 1 (I’m guessing the Common Cause gerrymander merged with League case).
* This opens the door for challenge on the other state constitutional amendments not included in this case (I’m sure someone is scrambling to file ASAP!) This judge was particular on who may have standing for filing to challenge each amendment.
* This also opens the door for challenging any decision made by the legislature, after the US supreme court hearing, which requires a super majority. The constitutional changes are just the tip of the iceberg there. The Republicans have used their super majority status (until the very last election) to override many vetoes, and do other structural changes. So I’m also sure lawyers are now combing through those to see if any were done in the same window and if they can find a group with standing to sue.
* Seem to remember the legislature pulling funds from the AGs office since they didn’t trust the AGs office to defend them (as previously noted is in Dem hands) and they needed the money to hire lawyers to handle all the lawsuits already against them. They are going to need even more money now.
* This line of reasoning may get overturned, but the discussion being had is good. Just in time for a push here to get the next amendment to be against gerrymandering. Ha!
Oh, even better, on another local blog found the ruling pdf:
Here is the SCOTUSblog link on the case he cites:
(It was consolidated with vs Rucho the one I was thinking of earlier)