Firo watches her perform her little test with a raised eyebrow. He'd be smirking if he weren't slightly concerned about her--what is she doing?

"Huh. ...You feelin' okay, then? Not gettin' sick or anything?"

Firo is, of course, aware that people blush when they're embarrassed. But there's no reason for Rey to be embarrassed, is there? Fever might be more likely, if that's a problem for a woman who can go up like a torch.