Alahazra began with those she healed, but then questioned Almah's personal guards and the remaining mercenaries as well. Here is what she learned ...
Spoiler: Alahazra's Report: Almah's and Caravan Guards
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Almah’s personal guard were all standing guard at her tent when the fire started—none of them saw anything suspicious at the astrologer’s wagon, but one did catch a glimpse of Dashki trying to hide behind a tree nearby: “It was clear that he was trying to get a look into Almah’s tent. That boy is obsessed with her.”

This places Dashki quite some distance from the wagon when the fire started, evidence in favor of his innocence.

The mercenaries were enjoying themselves around the feast-fire, finishing off dinner with a sturdy drink. They weren’t too fond of Eloais and thought of him as a weakling. When asked about Dashki, the guards confirm that he wasn’t at the feast-fire with them, and one muses that he was probably spying on Almah—his obsession with the merchant princess is something of an open secret, with only Almah seemingly being oblivious to his attentions.

None of the mercenaries has a high opinion of Dashki.

The mercenaries make a few lewd and suggestive comments about the relationship they suspect Eloais had with Almah, and wonder if Dashki might have burned the astrologer’s wagon to “get rid of the competition.”