Victor isn't fast enough to get between them, though that's her impulse, to dive between them, and she does it too late because of her lack of superspeed and the fact that she was decently far from April to start with so that Lex would be looking at her and not her, and she knuckles another piece of kryptonite (one she brought from home, from her backpack). "Back off, dude."

Though there is a twinge of something upset at the happenings. She doesn't feel as in control of the situation as she did before, he wasn't supposed to focus on April, this was never supposed to happen this way, they were going to truth spell him, ask questions which he would comically have to answer, find a way to save Clark, because he's their only lead. They need what he knows.