وَقِيلَ لَهُ: ابْعَثْ شَاةً تُذْبَحُ فِي الْحَرَمِ، وَوَاعِدْ مَنْ يَحْمِلُهَا يَوْمًا بِعَيْنِهِ يَذْبَحُهَا فِيهِ، ثُمَّ تَحَلَّلْ.
Translation: He is instructed to send a sheep to be slaughtered within the sanctuary, agree on a specific day with its bearer, then exit ihram.
The order matters: dispatch the offering, agree on a definite slaughter date, and only then effect release at the proper time.
The expression thumma tahallal places release after the prescribed offering arrangement. The mere existence of an obstruction does not cancel ihram restrictions.