How can I make my game kick someone when their health hits 0?
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Optional Sources:
These links are good sources that you can refer to when scripting. They aren't really that hard to find, so a little bit more time spent upon research and you should be able to get these information.
Most of these sources hinted that you should use a server-sided script for these elements to work as expected on servers.
Post your question along with your code next time, too!!