若一个人对另一个人使用或威胁使用非法暴力而且他的行为使一个在场的正常人为自己的安全担心时，他就犯有在公共场所斗殴罪。

A person is guilty of affray if he uses or threatens to use unlawful violence towards another, and his conduct is such that a reasonable person who happens to be presented may fear for his safety.