Yes. It's happened before. After the Boston Marathon bombing there was a "shelter-in-place" order given that prevented anyone from leaving their homes, and subjected residents to military rule (including door-to-door warrantless searches).
Pretty much. In the Uyghur concentration camps they regularly gather up the victims of the camps and have them watch beatings and brutal rapes. I've read that in the testimony of several escapees from the camps. That plus everyone gets "minorly" tortured for not learning Chinese fast enough or minor transgressions like looking away/closing eyes/crying when told to watch a beating.