There was absolutely nothing I could do. No one believed me. Even though I told the teacher that Xu Wu Cheng pushed the bookshelf over, she wrote it off as an "accident." I showed her the recording, of course, but she dismissed it.
"Use your common sense," she had told me with a laugh. "Of course it's a freak accident. Unless you used magic β and since we didn't sense any mana from him despite being in the same space β there is no way for a normal human to physically push a bookshelf over. The shelf weighs about a ton or two!"
She had me there. Again, I told her that Xu Wu Cheng was a vampire, and all I got was another laugh in return.