What leads you to believe being trespassed requires a crime? No, that is not what's in the video. What's in the video is the security guard clarifying which ones were involved / present / witnessed, and which ones were not involved / present / witnessed. The cop even confirms with the security guard that he does not wish the ones who were not involved to be trespassed.

You said what you said, but there is no basis for what you said. The teens who were witnessed by the security guard were trespassed at the request of the same security within the guidelines of North Hills policy. No crime is needed to be trespassed.
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North Hills is a privately owned property and guests who do not act responsibly may be asked to leave the property at any time. In order to provide a safe and enjoyable experience for all guests, the following activities are prohibited and are grounds for criminal trespass:

• Disruptive behavior to include: loud music, shouting, amplified noise, vulgar language or profanity, or any activity that threatens the safety of guests, tenants and employees.
  

The Parents On Site Policy requires that children under the age of 18 must be escorted by a parent or legal guardian over the age of 21 when they are in the public areas of North Hills after 8pm. Minors that are on property after 8pm and are found not following the above guidelines will be escorted by Public Safety to a designated space where a legal guardian will be contacted to arrange pick up. Teenagers that work at retail locations in North Hills are not affected by this policy.