> “If hyou changing your mind, offendi, I give hyou twenty-five camels, no problem,” he said, pulling a clove from his teeth. “May your hloins be full of fruit.”

> “I go, I hcome back,” he growled happily. “The Prince hsays the degree is Doctor of Sweet Fanny Adams. A hwizard wheeze, yes? Oh, how we are laughing.”

At the start, Ankh-Morpork and Klatch are in diplomatic dispute over what to do about the newly-emerged island of Leshp, smack-dab in the middle of their waters.

We read the hum-drum, everyday racism and xenophobia through the mouths of Sergeant Colon and Corporal Nobby Nobbs

> “And o’course, they’re not the same color as what we are,” said Colon. “Well…as me, anyway,” he added…

> “Constable Visit’s pretty brown,” said Nobby. “I never seen him run away. If there’s a chance of giving someone a religious pamphlet ole Washpot’s after them like a terrier.”

> "…Whereas we’re more civilized, see, and we got a lot more stuff around to count, so we invented numbers. It’s like…well, they say the Klatchians invented astronomy—”
“Al-tronomy,” said Nobby helpfully.

> “No, no…no, Nobby, I reckon they’d discovered esses by then, probably nicked ’em off’f us…anyway, they were bound to invent astronomy, ’cos there’s bugger all else for them to look at but the sky.

When the Prince's life hangs in the balance, after an assassination attempt, Ankh-Morpork mobilises for war. Everyone suspects Klatch of a false-flag - everyone, that is, except for Vimes. He suspects his own fellow Morporkians first.

Only later, when Vimes confronts Ahmed in Klatch, do we see that the Klatchian caliphate and its people are 𝘯𝘰𝘵, in fact, noble savages. Its government is just as ruthless as any other, to assassinate one of its own statesmen to justify a war over some rock.

At once, the switch in Ahmed's character is a twofer: First, it's a callback to his 'foreign' persona in Ankh-Morpork (he knows the city as well as any student of the Assassin's Guild should).