You can see Jackie tense up at his voice, trying to look over her shoulder, Horatio is here!

The woman on the other hand is not so happy to see H. She has that trapped look, one usually reserved for rabbits and cornered criminals looking for a way out.
"Drop it," she says, gripping her gun with a bit more determination. "Or she dies." She could shoot her very easily at this range and right now it's all she has to bargain with.