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If Rurek had witnessed the talking sword of Ona simply setting off to accompany some human, he would have been very upset. Fortunately, he wasn't there.
"Well, this explains a lot..." the Sord scratched his head. He clearly liked the theory about his brethren. "It seems they decided to check for sure. They organized some kind of... expedition! I bet this whole group of travelers will get lost somewhere in the tunnels. They could be doing something useful instead."
But the expedition did have some benefits. If they really find the true surface, then perhaps most of the humans will leave Iczakan and stop bothering the honest Sords.