All employees whether casual or permanent are covered by the same laws when it comes to safety compensation etc have the same rights.
If you are fired and a casual you cannot claim unfair dismissal as there is no guarantee. Each shift is seen by the law as you starting a new job every day.
The threats by another employee should be reported to the employer. But you do not have a claim for unfair dismissal.
This is also a criminal offence and you should report it to the police.
You may have a claim under general protections.
Use the following link to see if you are eligible.
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