Nothing to see here.
Here’s a suggestion: Since it is widely expected that S will HTF right after the grand jury makes their announcement, why don’t they somply fail to make any announcement? Just let it ride. Make no changes. No announcement. No decisions. The dead guy is still dead. The police guy is still not in jail. So, it’s all good. The riots are thus avoided and all those federal troops can go home.
Then, during a serious snow emergency, announce, “oh yes, we decided that back in November”, and dare people to go outside with their snow shovels and start something.