User blog comment:TheNewProtagonist/Episode 10: Now that's what I'm freakin' talking about!/@comment-76.94.106.127-20130920012616

I presume Weiss changed off-camera between episodes to fight the Boombatusk. Incidentally it seemed pretty clear to me as soon as I saw the box that this is what Weiss would be fighting. It was the only one of the sketches on the board in the classroom that we hadn't seen yet.

The rolling thunder attack surprised me too, though. :p