Dogs and shotgun guys can push you with their attacks. The 2 guaranteed dogs and 1 shotgun guy were used to damage boost for that little bit of extra speed needed to break the 45 second mark.

The setup to arrest the target before his bodyguard shows up is mostly consistent. On rare occasions he will wander off before you finish. The mission will not complete until the fanfare for the arrest finishes, so getting him before killing the bodyguard saves 2-3 seconds.