In this task you are given a sentence with one coordinating conjunction (for, and, nor, but, or, yet, and so). You must judge whether the order of two coordinated clausal conjoints have been inverted or not. Inversion would result in the sentence sounding unnatural. Label the instances as "Original" or "Inversion" based on your judgment.

Let me give you an example: He knew it , and he deserved no answer .
The answer to this example can be: Inversion
Here is why: "He knew it" and "he deserved no answer" have been inverted.

OK. solve this:
She feared the mood had been broken , and his jaw flexed .
Answer:
Inversion