When picking a character build I like to find synergies between skills. However I also try to use some common sense.
It's quite obvious these two talents shouldn't work together the way they do and is undoubtedly getting patched at some point.
The way Comeback kid should work is quite clear, and IMO not good enough to warrant a pick. If you have 1 enemy left making only 1 attack it's potentially godlike (when you can heal in your turn) but with lets say 4 enemies each making 2 attacks per round, surviving 1 attack won't help you all that much.
