Anyways, I was busy hoofing it over to the volcanic region to hit the Evergleam to complete the relevant quest. I came prepared because on my last play through I repeatedly got hit by dragons in that particular area. Plenty of potions, arrows, poins, soul gems, etc.
I was leading my follower, Faendal, and Maurice down the road, and stopped at Mixwater mill for a minute to take stock and make some last minute adjustments before continuing on.
Cue the Dragon theme music.
As soon as the music starts, the bow is out and I'm hauling A to a better vantage point. Being lightly armored, being able to move quickly to get away from these elemental attacks is what has saved my hide so far; my quick reflexes perk and bow and shield mobility perks have proven invaluable for this.
I'm looking around for the dragon to fire off a shot, when big blast of flame erupts to my right. A flame dragon. No problem.
I pop off a quick shot as he's flying up, and look around to see where faendal is at. He's over by the river, but I see Maurice running off to my left at something, and then he suddenly gets mowed down by not one but two separate frost attacks. I look up and see two more dragons flying around Mixwater. After I crapped my pants, the only thing left I could say was Wtf?
I had about ~120 hours on my first playthrough, and never once saw more than one dragon in one location, much less three in the same small area. What gives? Has anyone else seen this before, or was this just a glitch?

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