وَإِلَّا فَالْخَرْقُ وَالْالْتِئَامُ عَلَى السَّمَاوَاتِ جَائِزٌ
Otherwise, opening and rejoining in the heavens are possible.
Kharq means making an opening or division in something contiguous; iltiʾām means its rejoining. The argument denies that heavenly bodies should, without adequate proof, be assigned a uniquely immutable nature ruling out all such change.
This reply does not purport to draw an observed physical diagram of the Ascension. Establishing possibility and explaining the exact mechanism are different undertakings.