You can't- you mustn't! [Even though the ring is lacking in true omnipotence, she's still very afraid that he'll learn and understand things he shouldn't, or that the feeling of all that power might change him somehow. Most of all, though, she has to go kill Jack.]
You aren't a Vindicator-- [Even during this terrible struggle, she's mindful not to hurt him. But even so, she's desperate, and she tries to work her hands toward his so that she can stop him.]