Just witnessed an undercover cop arrest someone.

Guy was running towards me being chased by a person shouting "Stop! Police!" - guy trips right in front of me and cop has gun pointed on him within a second, hand cuffs him and calls on cell for backup.

It was all in French too.

"Arrete! Police! hausse Les mains! Hausse Les mains!"

Sunny day in Montreal; crime fighting is happening all around
you.