Or did We create the angels female while they were witnesses!
means, how did they decide that the angels are female when they did not witness their creation?
This is like the Ayah:
وَجَعَلُواْ الْمَلَـيِكَةَ الَّذِينَ هُمْ عِبَادُ الرَّحْمَـنِ إِنَـثاً أَشَهِدُواْ خَلْقَهُمْ سَتُكْتَبُ شَهَـدَتُهُمْ وَيُسْـَلُونَ
And they make the angels females who themselves are servants of the Most Gracious. Did they witness their creation Their testimony will be recorded, and they will be questioned! (43:19),
which means, they will be questioned about that on the Day of Resurrection.