وَلَا يَجُوزُ ذَبْحُ دَمِ الْإِحْصَارِ إِلَّا فِي الْحَرَمِ.
Translation: The obstruction offering may not be slaughtered outside the Haram.
This is a location requirement. The animal need not be slaughtered where the obstructed pilgrim is stranded. It must be slaughtered inside the sanctuary boundaries.
The place of obstruction and the place of sacrifice must not be confused.