I honestly don't know as had the game only since H&H. I read a lot of Deathsquito horror stories so was even surprised that I could take 2 hits and only lose 50-60 health or so, but that was silver armor. Still from what I read I believed they would still 1 hit me.

Its possible that you got lucky and it hit on its lowest portion of its damage range. I'm sure some experts will clear things up before to long.