Quiet down! I don't want these novices around us to hear what we're about to discuss.
Listen up... <name>, is it? Soon, you'll learn something that'll change the way you operate as a rogue. You'll be able to follow up on your attacks with a deadly finishing move. Maybe even slide a dagger between their vertebrae.
To learn it, you just gotta get some more experience. Don't worry, you'll figure it out.