Learn what "i can't let anyone leave here alive" means, when people say it, and how to use it naturally in English.

It is a violent threat meaning the speaker intends to stop everyone from escaping, even by killing them.
From School Hall, Episode 49
Someone is saying that they cannot allow anyone to survive and leave the place.
This is extremely threatening and not appropriate for normal conversation. It is only useful for understanding violent dialogue or fiction.
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