The proper response would be to cuff him, take him to jail, and call a tow truck for the vehicle. Then, in a day or so, he should be taken before a judge for the preliminary hearing, and the setting of bail. He then could pay storage fees and recover his vehicle.
So, after all, the cop’s actions were “the proper response”.
He just had to use his tazer to accomplish the cuffing part.
As former cop, you are FOS. Cuff him, jail time, tow the vehicle when the wife could drive.
No, the proper response would be for the LEO to explain that the signature was not an admission of guilt, only an acknowledgement to appear before the court.