Oh, oh, so many things. I was waiting for the kid to stumble and have it rip his face off, and then I wanted him to suddenly eviscerate daddy when he let his guard down. Truly horrifying.
Look at what's happening here and think about how it might progress within the week. The entire reason the Bat'leth was introduced to Star Trek was to weed out those stupid enough to buy them. Or at least take them out of the gene pool.