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 To The Foreshadowing!

Straight up, Kaito is a corpse. Think about it, his biowhatevers were failing and Ichika has to "repair" him. In this episode, an alarm goes off a life sign being in the house. If Kaito was alive, there would already be his as well.

OR

 Spoiler

She simply knew that it was only her and Kaito in the house. Therefore another lifeform showing up under her nose would surprise her. I like your theory but i think you are thinking too deeply about that part

Ano Natsu episode 5: It just keeps getting better and better. That ending is such a cliffhanger. NEXT EPISODE NAO.

Symphogear episode 5: Hibiki is becoming a total badass, more lesbianism, an actual villain, HIRARIOUS Engrish and some cryptic clues. I'm pretty damn sure that the scientist lady is the main villain.
She has similar length hair (but styled slightly differently and brown rather than blonde), the same lipstick, the same Butterfly motif, the same lesbian tendencies, she disappeared just shortly before the assassination and reappeared with a case with blood on it. She also has access to all knowledge about the relics. She also has combat abilities (read as: magical powers) as displayed in this episode. And the look that Chris gave her when Hibiki used Durandel was a look of recognition.