[Tifa spots the flicker of her before she vanishes behind the line of people leaving—it's so fast that she thinks she likely hallucinated it, but she's not going to waste any time in getting them outside into open air and a wider space, where she can easily see everything and everyone.

She ponders it for a moment before she loops an arm through Eustace's and presses herself close, and nudges him out of the theatre, still looking back at the stairs every now and then. Meanwhile, she's close enough that she's able to whisper to him without running the risk of someone else hearing her.]

Outside. Just... stay close, okay?

[Whoever this woman is, Tifa has a bad feeling about her, and her intuition is usually right. So once they're out in the open, through the front doors of the building, Tifa brings him to the wall and gazes around.]

There was someone in the theatre. Don't know what it was, but... I didn't like the way she was looking at us.