I guess it boils down to possible development; for all we know, Kitty might be too pre-occupied to notice until it's a little too late, but then she surely owes Lockheed at least a modicum of trust after all they've been through? I doubt she'd sit idly by if he was about to tear the flesh off of her or her friends, after all. But we'll see; it could just be the artist felt like having a dark joke.