Extend her premise to its logical outcome and it becomes a reductio ad absurdum since...
these arguments are largely a reductio ad absurdum of other theories
Bertrand Russell -- The Analysis of Mind
If such a thing were needed as a reductio ad absurdum of the enforcement of contract, such a folly would do that for us.
William Morris -- News from Nowhere
He went after it first, using the reductio ad absurdum.
Robert M. Pirsig -- Zen and the Art of Motorcycle Maintenance
 So long ago as 1867, Gould protested against this elision as barbarous and idiotic, and drew up the following /reductio ad absurdum/: At last annual meeting of Black Book Society, honorable John Smith took the chair, assisted by reverend John Brown and venerable John White.