Rudy is a good lawyer, but he IS a loose cannon. My God, just watch him on TV. He waves papers about like he’s fanning the devil, and literally spits when he gets excited (which is pretty much a constant with him). His optics are TERRIBLE! The best lawyers are the ones you never see and never hear from.You contradicted yourself and you need to look up the meaning of "a loose cannon".
I know well the meaning of “loose cannon.” It is a nautical term that originated during the days of the old wooden men-of-war, where an unsecured (loose) cannon could wreak havoc on deck. So, a “loose cannon” can damage or harm that with which it may come in contact. In Rudy’s case, the term “loose cannon” applies to his client being harmed, or not well-served.