When disfellowshipped and thus handed over to Satan, the sinner was again part of the Devil’s world.
لِذلِكَ إِذَا ٱرْتَكَبَ فَرْدٌ مِنَ ٱلْجَمَاعَةِ خَطِيَّةً خَطِيرَةً دُونَ تَوْبَةٍ ،‏ فَإِنَّهُ يُفْصَلُ .‏