November 26, 2012 7:10 PM EST
Dawnguard in the frozen lake when 2 dragons can bursting out of the ice.
The dragons were wrecking me and I made a a very dramatic run into the closest break in the ice with the help of hilt-skin and argonian water breathing I was able to just barely survive that fight by constantly escaping into the water.
Serana also mysteriously disappeared the entire fight. I was on my own for some reason.