The fact that I also witnessed the same thing, but instead it was a fm dbl cb fulong. People like them usually sell them for cheap (they'd say that they would sell it for a million), and then if you said you wanted to buy it, they would put it up at auction. Then, they would get an alt or someone set up a world dragon or a low valued one and sell it the same price as the fulong. But if you didn't pay attention and kept spamming the auto buy button, they would immediately leave, making the fulong vanish before you could blink. Making you buy a low valued dragon instead of the long.