Something really strange happened to me. I activated Wilbur and the enemies got the defense down but not the shared damage.
As you can see, I’m on Wave 2, which means there is no boss who could have given him some sort of blind.
Other than Wilbur, no other hero can give the defense down.
Please correct me if I’m wrong. I checked the screenshot multiple times, maybe it was my mistake but doesn’t seem so.