Here he is. http://www.youtube.com/watch?v=v80gUzq6Ec8&list=PL5AD940AFA5E82598&index=17&feature=plpp_video
THAT'S THE MOTHER FRACKER!!!!
Interesting how he didn't sneak into any houses, & murder anyone. He just stood there, until the PC got too close, & then turned hostile. And only towards the PC.
He did the same thing to me. I was in Solitude and was making my way home, as I was passing by the cart market( just after Bits and pieces ) I noticed a man dressed in hooded black robes but didn't think anything of it. As we drew closer I could see that his gloves had steel finger tips, then I noticed that he was trying to keep his face hidden, as we started to cross paths our eyes meet and it was instantly apparent that he was a vampire, so he sprang into attack mode. I was over weight by 200lbs and was unable to move very fast which compounded the situation. Luckily though enough of the towns guard noticed him as well and aided in the defense of Solitude, it was a very well done and it was enough to keep me out of every city / town unless I REALLY had to go in. This was on my Dawnguard toon, I have yet to bump into the traveler on my vampire toon.