Edited sentence: Also, pits usually only occur in one place at a concert and rarely move on from there.For the record though, anyone at a hardcore show has the choice of joining the pit and therefore it is something you do at your own risk.Music genres are the biggest influence on ferocity in pits.Non moshers keep an eye out for people who may be hurt in the pit and help push anyone who starts to get to close to the edge of the pit back in providing they are still moshing.People who do not participate in pits form a required circle of bodys around the pit and help keep it in it's place.Pits vary in ferocity and size everywhere you go.Softer kinds of hardcore music generally attract more people but have less dangerous pits.The harder kinds being the most brutal, yet seeing how these genres are not as popular as some others, they are not always so big.This is another form of safety at pits