Who you knock out a 12 year old that attacks you because he is white knighting for a woman?

Basically, a 12 year old white knight sees his lady get offended and put in her place. He comes to his lady aid by attacking the male he believes violated his ladies owner. If you were the older gentlemen in this exchange would you knock his ass out?
Yes
No
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Who you knock out a 12 year old that attacks you because he is white knighting for a woman?
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