FGD135
The legal precedent has been established, and reinforced many times, that "normal" means what a group of employees "generally" do - and has nothing to do with their contract.
Would you mind quoting the exact court case that established this as a precedent? I find it very difficult to believe that a court would rule ones personal decision not to work on days off as unprotected industrial action. Even in Hong Kong which makes Australian labour laws look pro employee, individual contract compliance isn't regarded as industrial action. If I choose not to work on my days off because I consider doing so too fatiguing that is my business.