(I haven't read books so sry)

You're just flying on your (dragon type) dragon named (D/N) just outside that giant fog bank that kept you from exploring any farther. Suddenly (D/N) roars and puts on a burst of speed, and you have to scramble to grab something to hold onto. You look at what (D/N) was so excited about and nearly scream. There are several other dragons of different species with other humans riding them! Who are they?

What happens next??