Has anyone else run into this random event yet? I've had Dawnguard since xbox release and after hundreds of hours of play time i just now ran into them... it was pretty dang surprising.
For those who don't know, there are vampires (fledglings in my case) disguised in the apprentice robes that we see the Vigilants wear and they call the Dragonborn over to them and attack you. I'm not sure if they have any other dialogue other than "Hey you, get over here" because they attacked the moment i discovered the bodies of some naked vigilants.
Anyone know if there's some dialogue to that random encounter?

I don't think so, I've seen it and they always just attack you when you get close.

I've had it twice. You can't interact with them through dialogue, if that's what you mean? They just attack you.