Leonhardt happened to notice you practicing with your weapon in the alley behind the pub, and he saw a slight mistake that could lead to injury. So he called out to you, "Watch out kiddo, you don't want to be breakin' yer arm, would ya?"

Leonhardt noticing that your grip was starting to slip. He frowned for a second, before stepping forward and carefully adjusting your grip, holding your hand to show it. "See? Like so, nice and steady. That way you don't get a cramp, so your weapon won't get knocked out of your hand."