Ablution with water left over by a cat and the concession in that

It was narrated from Kabshah bint Ka'b, who was married to one of the sons of Ab Qatadah, that:
She poured water for Abu Qatadah to perform ablution. A cat came and drank the water, and he tilted the vessel for it. She started looking at it (in surprise) and he said: "O daughter of my brother, do you find it strange? The Messenger of Allah said: 'They (cats) are not impure, they are of those who go around among you.'"

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ، أَنْبَأَنَا مَالِكُ بْنُ أَنَسٍ، أَخْبَرَنِي إِسْحَاقُ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ الأَنْصَارِيُّ، عَنْ حُمَيْدَةَ بِنْتِ عُبَيْدِ بْنِ رِفَاعَةَ، عَنْ كَبْشَةَ بِنْتِ كَعْبٍ، وَكَانَتْ، تَحْتَ بَعْضِ وَلَدِ أَبِي قَتَادَةَ أَنَّهَا صَبَّتْ لأَبِي قَتَادَةَ مَاءً يَتَوَضَّأُ بِهِ فَجَاءَتْ هِرَّةٌ تَشْرَبُ فَأَصْغَى لَهَا الإِنَاءَ فَجَعَلْتُ أَنْظُرُ إِلَيْهِ فَقَالَ يَا ابْنَةَ أَخِي أَتَعْجَبِينَ قَالَ رَسُولُ اللَّهِ ﷺ " إِنَّهَا لَيْسَتْ بِنَجَسٍ هِيَ مِنَ الطَّوَّافِينَ أَوِ الطَّوَّافَاتِ " .

It was narrated that 'Aishah said:
"The Messenger of Allah and I used to perform ablution from a single vessel, when the cat had drunk from it beforehand."

حَدَّثَنَا عَمْرُو بْنُ رَافِعٍ، وَإِسْمَاعِيلُ بْنُ تَوْبَةَ، قَالاَ حَدَّثَنَا يَحْيَى بْنُ زَكَرِيَّا بْنِ أَبِي زَائِدَةَ، عَنْ حَارِثَةَ، عَنْ عَمْرَةَ، عَنْ عَائِشَةَ، قَالَتْ كُنْتُ أَتَوَضَّأُ أَنَا وَرَسُولُ اللَّهِ، ﷺ مِنْ إِنَاءٍ وَاحِدٍ قَدْ أَصَابَتْ مِنْهُ الْهِرَّةُ قَبْلَ ذَلِكَ .