One of the principal difficulties with extending liability in such cases is proving the behaviour in question to show that the controlling group member was acting as a de facto or shadow director.
在这类情况下，扩大责任范围所遇到的主要困难之一是，如何提供相关行为的证据，以表明集团控制权成员发挥了实际董事或影子董事的作用。