Sia(j)(n) can be used for any of the third person pronouns, and only works inside its own clause, referring to the subject of that clause. You're absolutely right, "iliajn" should be reiterated. Thanks for changing it, Fred, for the sake of some confused beginner learners and the rest of us Grammar Nazis.
To be honest I had forgotten that I had written that until yesterday, then seeing the gripe, and re reading the sentence, it became glaringly obvious what error I had made.
The whole point of these exercises is to learn from our mistakes, ĉu ne?
(And even us malnovuloj who've been doing this for years, can make mistakes… it's called "being Human."
It sounds like "Kiel" rather than "Kial". I guessed why rather than how once I realised what the full question was, but "How did the chicken cross the road?" would have been a valid question. I have even read a SF short story on the subject of how chickens could try to cross a road, perhaps by Larry Niven.