I think this kind of trigger system isn't popular and you might have seen it in some maps.
This "bug" is from XnX (via xnx-simple)
I am pleased to share it with the community.
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If you have played xnx-simple before, you might have noticed that the swords slice very fast. It is because this trigger system has something to do with swords.
You need 2 triggers and 2 timers.
Because copying is easier than explaining....
Just see mrblake213-test
You will see it at the end of the map (far right)