You talk to other people and agree on a plan of action? Have you ever, in your life, interacted with people?
Yes but than the plan of action takes form of authority. Which is the point that Engels makes.
One example doesn’t even grant any authority: A delegate has no authority.
Then noone is required to take the delegate serious. The delegate enjoys no authority and there’s no organization happening as everybody is free to do whatever th fuck they want.
holding up a stone thing”: You make authority such a broad term that not just organisation, but physics itself is impossible without it.
Only when you take it in in bad faith, because we’re talking about people and not inanimate objects (stones). The definition of anarchists is just another social construct that basically describes authority…