The piece should fall out harmlessly at 200rpm, but always be ready if it doesn't. The biggest danger when turning are (1) getting you or your clothes caught in the chuck or piece, (2) the whole piece coming out of the chuck, and (3) the most likely, a shaving going someone it shouldn't like your eye or more likely - down your shirt when it's super hot
Even when the lathe is stopped, expect that every edge and every shaving is razor sharp.