What would be the appropriate procedure in subduing a 16 year old teenager with suspicion of mental illness?
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I didn't see an immediate need to subdue, but if I did, best practice is to swarm them with several folks control them, and restrain and/or sedate them. Ideally get 5 on 1 mixed team made up of hands on control techniques trained folks and nursing staff. One person assigned to each limb, and one to inject. We'd also have involved a Dr for their determination that restraining/forced treatment was medically necessary. (and also for authorization to restrain/sedate.)
I avoided solo takedowns unless they were actively attacking and disengaging was not an option.
Yes, I actually used to do that for a number of years as a part time gig to make extra money. The folks I worked with were all on the same page of using force as a last resort, and treating patients as patients. Almost all of us had backgrounds in Fire/EMS/ folks going into or retired from police work etc. and were accustomed to dealing with folks under stress.