kinda like the old stop, don't, stop, don't stop, don't stop,,,
I think you may have inadvertently hit on the crux of the problem. The cop in question is undoubtedly highly educated and speaks (and only associates with people who also speak) perfect English.
He was confused by the vernacular double negative - 'Don't Punch Him No More' - and thought he was complying with the wishes of the crowd for stricter measures.
(Do I really need to tag this as sarcasm?)
kinda like the old stop, don't, stop, don't stop, don't stop,,,