Yale had difficulties to believe the information given by the Divine Life Eyes when he used them on Hyrk, but he decided to trust his Special Innate Talent and thus stopped Nurvey from going towards Hyrk.
Nurvey was shocked by Yale's reaction because, at the start, Yale had also rushed towards Hyrk with her.
"Any problem?"
Nurvey didn't like how Yale had stopped her, but she believed that he had a reason to do that. In fact, after being stopped, she believed that maybe the Hyrk in front of her was fake and wanted to kill her.
Yale seemed to guess Nurvey's thoughts as his next words replied to her doubts.
"He is the real Hyrk; there is no doubt about that."
The Divine Life Eyes had told him Hyrk's name because even the normal Appraisal could do that for someone who was just at the Apprentice Rank, and moreover, Hyrk was heavily injured, so it wasn't difficult for Appraisal to obtain his true identity; his problem wasn't his identity.