OG SC 107,关于定语的一个问题

正确的句子是：

In his research paper, Dr. F, medecial doctor of PWC, dustinguishes between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psycosis.

OG中解释说“perhaps violent without being grounded in mental disease" is awkward and unclear。

虽然不讨论这个问题，也可以选出具体答案，但是，关于OG的这条解释我不是很明白。我觉得perhaps

 violent without being grounded in mental disease也没有什么不可以的。是不是必须是“perhaps being

violent......"才能用在这个地方？

请指教。