The shredder is typically used in large buildings with a large number of bathrooms, the idea being it will shred anything poured down the drain. now women will at times flush a tampon and it may clog up the system, this guy is showing how tampons are now not a problem
Unless you either gummed it up, or became too wide for the aperture (maybe not even then) the answer is a probable yes, unless it has some other sort of safety mechanism, seeing as it took that blanket like a champ. You'd never be operating this alone, and your partner(s) would probably instinctively shut it off as soon as you started screaming.