Insta death in battlegrounds?

Last night on pc na I had several normal matches, but two stood out where I died 20 times combined. I'm usually good for <5 despite running 22k hp. Even when I swapped food mid match to 29k hp, insta death. My health would be gone with basically full resources and block didn't seem to mitigate any damage. Exploits? Or just seasoned pvpers that know their classes/builds really well? It seemed to be dk and sorc related.

Update: 11 matches into the evening, 7 deaths, nothing out of the ordinary! One match I died 4 times, but that happens when you rush to flags by yourself.