User blog comment:Mckrongs/Monster Hunter Frontier Season Forward 4/@comment-3113587-20120525174329

So apparently, attacking Kuarusepusu's crystals when he flings them off and they're about to discharge will add a temporary thunder attack to your weapon for the next blow.

http://www.youtube.com/watch?feature=player_detailpage&v=V9dS92xqwmw#t=148s

That or I'm seeing it wrong. Seems interesting, at least.