(urth) Ultan's grammar quip

[Jason H]

Shadow Grammar Puzzle:

When Ultan meets Severian, he asks him whose apprentice he is; Severian
replies that Master Gurloes sent him and that Master Palaemon teaches the
apprentices; Ultan replies "But not grammar".

The implication of his little joke is that Severian made a grammatical error
at some point since they met. What's the error?

(I *think* I know, but I'm only 75% sure. So I'm curious what other people
think.)


-Jason
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