see how the ceramic ball goes further then the Ti itself? The blade locks on the ceramic ball itself and it functions as the normal ceramic ball that we are use to.
Here is my old Sebenza
Notice the mark on the lock face where it engages the back of the blade and where the detent is located. This is the normal standard that most framelocks function on.
The Umnumzaan is a while bread requiring so much tolerance to get right it is amazing IMO.