She's told that now she can see any Humans true name and lifespan just by looking at that Humans face but when she looks at Bobby she can't see his true name or lifspan, she's told by Kular that she won't be able to see the lifespans of anyone who touches the Death Note. Even if you have the eyes you can't kill me but your welcome to try, I doubt you'll get very far your only half the man Kira was