I never restrained anyone as a client or as staff.(In Dallas we became paid employees after graduation) I never thought that to be my responibility. There were times as a client that I was told by a 5th phaser to replace someone holding a limb. I really hated that shit. Sometimes they were bloody, sweaty and I felt awkward in that situation.
What I did do........
While I was on 5th trainee a girls non-custodal dad broke into the building to free his daughter. I grabbed him by the neck and threw him back out. (Noone called the police or anything, just told him to leave.)
I had one newcomer bolt out the host home front door on me. I chased, tackled, and beltlooped back.