Ordering this guy into his patrol car IS an arrest and requires a Miranda warning and the guy should have immediately requested to talk to his lawyer. You are not required to answer cop in a custodial interrogation (arrest) if you request a lawyer until your lawyer is present.
That’s not being “smart “ with a cop, but it is being smart and exercising your constitutional rights.
You should listen to this - informative and entertaining...
https://www.youtube.com/watch?v=_EZPGXHOj7M
Great video link, thanks.
bfl