If you don't want anyone else getting hurt, then you'll understand that sometimes one or a few people have to in order to save the rest.

[He moves closer, resting his blade in his free hand as he does.] That's fine. You don't have to tell me more than that. Just look here.

[He slices a good cut across his palm as he pulls his sword away from it. It bleeds, and it's crazy, but saying "I can heal" isn't as good as showing her just how quickly it happens. A few seconds pass while he reaches into his pocket for a handkerchief, and when he lifts it back up to wipe the blood away, she can see the wound close up.]