I had a red blinking outline on my health bar and I think it was a "telescopic sight" with cross hairs on the blinking red line. I moused over it but it did not tell me anything. It did not seem to affect anything, health didn't go down, didn't start missing a bunch of shots or taking more hits than usual from the mobs. When I moved my health bar it went right away and was gone.
My have been a momentary curse
My have been a momentary curse