Seems like the only way to fix this is to give negative glory of about double what you would have earned if you played. Outlier detection wouldn't be that hard to stop people from dying once and then afking.
That could be a dangerous precedent. Will there be a wipe every time there is a major exploit? Something along these lines could happen again. It's software.
Maybe we'll see PWE get creative and sue some of the exploiters for damages. I'm sure terms of service were violated, and there would be substantial cost to PWE to fix this. Make an example out of the folks that tried to wreck the game, and that might serve as a strong deterrent to future abusers.
Since friendly targeting is difficult, I'd like to see a smart heal that would seek out the lowest health character in the cone if target is empty. Ground effects for specials would look a lot better than the red ground. Easier said than done: Increase difficulty and content diversity.