Its happened quite often in the past. Its just a series of events that can occur where the Enemy will sometimes be like... Here, Live longer so i can have more fun killing you.
the Campaign Elvaan Fomor Enemy used to occasionally cast cure 1 on people lol
Edit: Directed more toward Otaria, I find this kinda stuff funny :O
I think it was trying to Cure the Killing Weapon, but it died before the Cure got off. Then somehow the Cure went to me. Still the most random thing I've seen in eight years of playing!