If he was in a room with the door closed, and he took off his garment to pour water on himself, shyness prevented him from standing up straight. (Using translation from Aḥmad 543)
«إِنْ كَانَ لَيَكُونُ فِي الْبَيْتِ وَالْبَابُ عَلَيْهِ مُغْلَقٌ فَمَا يَضَعُ عَنْهُ الثَّوْبَ لِيُفِيضَ عَلَيْهِ الْمَاءَ يَمْنَعُهُ الْحَيَاءُ أَنْ يُقِيمَ صُلْبَهُ»