I. AM. SCREAMING.
why can he walk away in the first gif but has to make sure it completes itself properly in the second one?
As long as the connection tip is less than halfway across, it wants to return to its original position. You can see in the first one he gave it a bit more of a push so he knows it will cross the halfway threshold and fall into place. In dynamics terms, there are three equilibria, two stable ones in the closed and open positions, and one unstable one in the exact middle.
i want this crazy door