The damage caused by a counterattack from a hero suffering a fatal blow was removed in the last update, under the guise of a “bug removal”.
All this has done is render ALL Riposte/counterattack heros largely redundant, thus crippling a lot of low to mid level players’ teams, where these types are a staple.
What possible harm is there to reintroduce what was a logical occurrence anyway?
As I suggested in a different thread, a simple rewording of the special to include (a rough example) “Dying Breath…counterattack with xx% of damage received upon receiving fatal blow”
This would (and could) allow you to leave the “bug” intact and, at the same time, not severely frustrate a huge chunk of the playing community.