The movement to the hidden blade earns Zack a smile. It's perfectly pleasant and at the time it makes sharks look toothless. Nothing in his body language changes suggesting that he thinks that he's threatened Zack with the knife. In fact he goes back to cleaning his fingernails with it.

"I suppose there are worse habits to have," he says, though he does sound like it's one that should be broken. "Has he mentioned anything about what you really are?"