Letters to the Editor
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looks like someone's been reading Schopenhauer again
If you find that you are being worsted, you can make a diversion — that is, you can suddenly begin to talk of something else, as though it had a bearing on the matter in dispute, and afforded an argument against your opponent... The diversion is mere impudence if it completely abandons the point in dispute, and raises, for instance, some such objection as “Yes, and you also said just now,” and so on. For then the argument becomes to some extent personal; of the kind which will be treated of in the last section. Strictly speaking, it is half-way between the argumentum ad personam, which will there be discussed, and the argumentum ad hominem.
http://ebooks.adelaide.edu.au/s/schopenhauer/arthur/controversy/chapter3.html