yadā — when; saṁharate — winds up; ca — also; ayam — he; kūrmaḥ — tortoise; aṅgāni — limbs; iva — like; sarvaśaḥ — altogether; indriyāṇi — senses; indriya-arthebhyaḥ — from the sense objects; tasya — his; prajñā — consciousness; pratiṣṭhitā — fixed.