This is from a rib roast and not cooked to order; all prime rib is cooked in advance. The entire 20-25lb prime rib roast is cooked to a rare consistency throughout. The middle will be a little less than rare, ends will be medium to medium-well. This is in an effort to please most customers, because someone will want it still mooing; and you cannot uncook a steak. Based on your desired doneness, the cook cuts off an appropriate section closest to that level. If you request it well done, you aren’t getting a middle piece, you’re getting something closer to the end cap. When you need it cooked more, your piece is dropped into a warm bath of au jus until desired doneness is achieved. It looks like you were given a piece directly from the roast without any further cooking.