Liz grins back at him until the conversation turns more serious.  When she hears his threats, even though they aren't directed at her, she can't help but shiver.  She can feel his power as the anger boils off of him.  And if that power were directed at her, it could wipe her out in a heartbeat.  A tiny ball of fear build in her heart, not that'd he'd hurt her, but that something would happen with this anger.  That he'd lash out, then be unable to deal with his actions when he cools down.  Unable to come up with a better solution, she decides to change the subject.<br/><br/>"So.. um... should I try again?  Or try one of the other ones?  Mentor on, oh wise mentor!"  She hopes her teasing doesn't get on his nerves, but it seems like the only way she can come up with to get out this nervousness from being around him.