??? Being grumpy about something warrants physical assault, huh

That's correct. They put out a pretty specific guideline for risk of being affected and basically if you didn't touch the mod during that time you're fine.

Robin Williams did. I'm sure other people do as well.

A warren typically refers to the series of interconnected holes that rabbits dig and live in. Part of the defense they provide is the difficulty that predators like foxes have when navigating them.

In this instance warren maze just refers to a deliberately difficult to navigate floorplan.