Rezo the Red Priest is, by all accounts including his own, not a 'party person,' but as one of the healers among the Corsairs it's his duty to patrol around looking for any drunkards or recently liberated servants who may be weak and in need of medical attention. Hence why he's in the feasting hall near Junia.

...Well, that and he's picked up a flagon of the dubious grog to bring up to his room later. But nevertheless, he IS operating in his capacity as a healer, and a coughing fit naturally draws his attention.

"Er, are you alright?" he asks, approaching the source of the noise. It's hardly the first coughing fit he's heard this evening, but he should probably check.