A sudden freak seemed to have seized him at breakfast... (Vol. II, Chapter 7)At first glance, it would appear that a character was kidnapped from the breakfast table by some sort of lunatic. (Yes, the use of "sudden" is a bit of a giveaway that something is amiss in this interpretation.) Not quite the sort of scene one would expect in a Jane Austen novel.
What "a sudden freak" actually means is more along the lines of "a capricious fancy."


