I've not gotten much further with Dawnguard (again) since I'm still working on my soon-to-be vampire character, getting him a bit further into the main questline, joining the mages college and a few other things, mostly just making him an established person in some areas before jumping into Dawnguard.
Still, I have screenshots.
"Having a nice sit down are we?"

"No you cannot eat me!?!"

Had a strange thing happen when I got sent to Robber's Gorge to pick up one of the Dwarven diagrams. Serana had apparently raised a bandit just as I was getting a kill animation on the bandit chief. I turn around to see Serana standing with this bandit, and then he turns around and calmly walks away from the little cabin and down to one of the tents and goes back to bed.

Most recently I had to track a master vampire by finding out his last known whereabouts from an NPC. This led me to his lair in Halted Stream Camp. So, I go into stealth, fast travel to Halted Stream and chaos ensues. First, I spot a dragon circling overhead (very strange, just a regular dragon and I'm lvl 52 usually fighting elder dragons all the time). The bandits are running around after the dragon, and then suddenly Serana and I are being jumped from behind by a trio of vampires. The bandits run over following the dragon, so now we're sandwiched between two groups with a dragon overhead that is flying a hell of a lot faster then it should. After dealing with the vampires I chase the dragon, who decides to land and fight a giant. When it takes off again, the giant obviously picks me out as the logical choice for vengeance and I'm suddenly backpeddling and trying to shoot the damn thing while it hammers the ground and throws my aim all over the shop. This is when the mudcrabs decide that everyone needs an arse-kicking. I'm just sorry that it was so chaotic that I didn't get any screenshots until it was over.
Anyway, back off to working on my vampire character.