My son since he could stand and walk would when angry or frustrated or scared go limp and then be perfectly still on the floor.
He has continued doing this to age two, we basically ignore it at home but that hasn’t stopped it and he doesn’t do it much anymore. The worst is when a stranger or unfamiliar person to him tries to talk to or interact with him in public, he drops and goes still.:smack: Even if holding my hand or even sitting on my shoulders which obviously can be dangerous so I have to catch him, the person doesn’t even need to be threatening.
The only way to deal with it other than picking him up is to loudly announce I am leaving the area and then do it, often that will rouse him and have him desperately trying to stay with me.