She would whirl around towards Anduin with a reprimand if the space allowed it, but there's a familiar person going through a very familiar breakdown, and Hermione's still holding onto said person's shoulder.

So she assumes the glow is a Lumos-sort of spell, and doesn't check what - if anything - she feels through the magic flooding the stairwell. Instead:

"He's having a panic attack," she cuts Anduin off, impatiently, a little bit harsh to boot. "And people having one generally can't give you lengthy detail of what happened and what they saw, as that point is not important."

Softening her expression, she turns her attention towards Wrathion. "Listen to my voice, okay? I'll guide you to some breathing - follow my counting, yes?"