This new rule came up logically, revealing itself as an unwritten rule that was already in the rules anyway. It was previously called “protection,” which has little or nothing to do with a word like “progress.” And here’s what the rule looks like:
“Regress is a character’s ability to limit his opponent’s progress. Whenever one character makes progress, his opponent may reduce that progress by subtracting regress, as long as they are of corresponding types.”
So protection reduces damage, or counterpoints reduce points, or whatever you’re calling your regress reduces whatever you’re calling your progress.