I say, and with God's success: His ablution is not invalidated; because the text here is contrary to analogy, so it is limited to its specific case, which is prayer, and it is restricted to it, thus there is no event outside of it; as Al-Daraqutni reported in his Sunan from Anas : "The Messenger of Allah  used to pray with us, and a blind man came, and he stepped into a filth on the ground, and he fell, and some of the people laughed, so the Messenger of Allah  commanded those who laughed to repeat their ablution and prayer." See: Sharh Al-Wiqayah, 2: 33-34, and Tabyeen Al-Haqaiq, 1/ 11, and Fath Bab Al-Inayah, 1/ 68, and Al-Ikhtiyar, 1/16-17, and Mukhtalif Al-Riwayah, p.344-345, and Allah knows best.