$1:
Personally if I was in an area when a riot broke out I'd go someplace else, not stand around to see if the cops are going to respond. Been on the receiving end of CS, Mace and OC if I can avoid it in the future, I will
Yet what constitues a riot, not all agree. Some times it just a large group of marchers chanting slogans as they march down a street. Some jerks in the middle of the group bust out some store windows. Police are called out being told that its a riot.