The sheep having been imported at non-trivial expense, they still have to reach Til Tomeil in good time, good health, and reasonably good order. Medraut didn't exactly volunteer to see the whole production safely down, but Gwalchmai can't be spared and Geffreyn refused point-blank, and while there is a long list of assignments he'd rather have had, at least it gets him out of town.
The fact is there's only so much time he can spend in Camallate before it starts getting him down. Even if it weren't for Arthur's carefully casual manner --
wish he wouldn't play dumb, he ain't any good at it -- or old Merdhin's hostile looks or Geff's continual complaints, the place itself unsettles him. It's too different from what he's used to, and at the same time too comfortable; he's not used to fitting in so seamlessly, and he resents it.
So he's willing enough to escort the woolly bastards to where they need to go, along with the supplies and the small knot of people with more expertise than self-sufficiency. By the time they get to Til Tomeil -- a forgettable town, far enough from the borderlands to be sleepy-quiet, not far enough to be particularly prosperous -- he's nearly relaxed.
Not entirely. His mother was born here, after all.
But enough that, safely inside the city limits, he leaves the party to sort themselves out and moves off to explore. He's only been here briefly before now, and if he's not going to head straight back to the capital he'd just as soon have a good look around.