If another employee is injured or killed, then that person's recourse is solely to the workers' compensation insurance system. The employer and you are immune, as long as you are accting within the scope of employment (unless, of course, you were to actually intend a physical injury to an employee, because that would be criminal assault, or murder).
However, if a third party is injured (customer, guest, inspector, bystander, employee of some other employer, etc.), then you could be held liable by the third party, because the wokers' compensation law only immunizes the employer and its agents/employees from liability to its own employees -- not to third parties.
Labor Code 2802 requires an employer to indemnify empoyees for losses incurred within the scope of employment -- so, even if you were sued by a third party, your employer would be on the hook. But, sometimes, an injury produces huge damages -- big enough to put an employer into liquidation bankruptcy. If your employer is not a large multinational business, then there remains the possibility that you could actually be liable for damages -- though in most cases, that risk is minimal.
Hope this helps.
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