Questions on the Explanation of the Book of Nullifiers of Islam

Question:
A person wanted to perform the full ritual bath to remove major ritual impurity, so he performed the ablution for prayer as part of it. During the bath, he passed wind. He then wanted to continue with the bath without repeating the ablution. Is that permissible for him? Or is it obligatory for him to repeat the full ritual bath for major ritual impurity, or to repeat the ablution?

Answer:
He only repeats the ablution. The full ritual bath for major ritual impurity is valid, but he repeats the ablution because he invalidated it, so he repeats the ablution.