I may or may not move but by definition, LAC will have moved. That's my understanding right now. It is like calculus. You have LAC + delta of LAC and stuff like that. The only question is who can move whom on which side. Correct me if my understanding is wrong?
Firstly it is a line of Control which means it is not an internally recognised legal entity. Second, it is actual meaning that it is a state of application of some force by which a defined or undefined line has come into existence and being controlled by further application of various means like the establishment of posts. patrolling, marking signs of control, signalling to another side that the area up to that line belongs to that side.
Such a line is either agreed to between the two sides or conveyed to the other side or is a result of control established on a certain date in the past or based on traditions, conventions or natural geographical feature such a river.
In India China Case, it is perceived in terms of a line conveyed by Chinese and Indians to each others. Indian line has always been McMahon line in East and area up to Karakoram ranges and some Kunlun mountains in Ladakh. India also had established some posts prior to Chinese invasions and a line joining those post also forms basis of Indian claims. Chinese having established their military control in Eastern Ladakh always conveyed the lines of their military control - Line of 1959, Line of 1960, Line of the military advance of 1962 and line of withdrawal.
In that way lines have been moving as per the convenience of the Chinese. Indian having decided on a particular line have been moving up to those area A state of conflict arises when the "perception" about the two lines clash. Those are "perceptions" only in the absence of an agreement or any side firmly conveying their perception to each other.
Though it is a state of uncertainty but forces from each side generally stick to their perceptions in showing Control unless it is deliberately planned otherwise.
The consequences of breaking each others perception is hostility.