Penalty, Punishment
If you try to say things with a knife, the police will put you in a net as your penalty for breaking the knife laws. You can't just go up to other people and say things with a knife out.
Imagine getting so mad that you use a knife instead of words to say what you're trying to say. A net falls over you and pulls you down. The knife goes flying. This is your penalty for acting like a crazy person.
ばつ
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Your penalty for breaking the law isn't over. Now that you're stuck in a net, you can't fight back when they hit you with bats (ばつ).
If you don't want to be punished with bats, maybe next time don't use a knife instead of your words.