From what I understand, the casualties were not inflicted while the "infiltrators" were still occupying the heights - that would not be a "withdrawal". The casualties were inflicted when Indian artillery opened up on the paths, routes and trails leading away from the peaks and back across the LoC.
So the fact is that whether the IA believed it was "Jihadis" or "professional soldiers" does not matter, since the attacks were conducted on the paths rather than the peaks.
Vish:
Any post would be "occupied" until a withdrawal was announced, and then the troops "withdraw". No surrender was announced. That the troops were attacked on the paths and routes, and not on the peaks themselves, indicates that the peaks were being vacated.
I fail to see what ambiguity there is here.