Final answer:
As a witness on bicycle patrol, if you see someone smash a car window, consider safety first and call 911 or for backup. If authorized, you may arrest the person, but always report the incident to ensure proper legal procedures are followed.
Step-by-step explanation:
If you witness a person smash a car window while on bicycle patrol, the appropriate action depends on several factors, including your role and the policies of the organization you are with. If you are a police officer or security personnel, you may have the authority to approach and arrest the person for mischief to private property. However, safety is paramount, so calling 911 or for backup before intervening is crucial to ensure the situation is handled properly and safely. You may observe and monitor the person until assistance arrives so you can provide a detailed account of the incident. It's critical to notify an adult or authority figure if you're not in a position to address the situation directly.