I am not talking back Ripostes or Backstabs(The enemies I am fighting are [spoiler]Rats[/spoiler]. Under normal conditions they would take out around 1/15 of my health bar with a single hit, then seemingly at random they kill me in one hit, the animations of their attack aren't different.
Not Bleed/Poison
It tends to happen when I am mid-swing I've noticed.
Best Answer
Absolutely.
I have been both parried and crit shield bashed by the skeletons in Hunters Copse. I am unsure if these are the only enemies that will do this, but it is definitely possible.
It is to note that there is still the destinctive crit sound that plays every time this happens to me.
Also, there is a recovery period of every attack in which you will take increased damage. If you are mid swing when you are hit, this will add to the overall damage output of the enemies attack (regardless of weapon).