I look forward to the day that a real attacker on the street will hold you in a relaxed way. That method may apply in the dojo to assist you with practice, but I have never seen or heard of this happening on the street, or in real life. Good luck to you.
I think you and I have different understandings of "relaxed grab."
The relaxed grab that my teacher demonstrates would be very unpleasant indeed to encounter "on the street."