If Carnage beating Domino in the current fight scene seems cheap, it's because it probably is. I've always been unclear on how many SFX are allowed per action/reaction, and had been assuming it was just one. But I realized I had several on that counterattack that seemed to apply, so I tried to Google a definitive answer and came back with this thread:
https://paizo.com/threads/rzs2...ying-Getting-started
About halfway down is where I read someone say that yes, you can use multiple. Of course this also applies to players, and hopefully doesn't break anything with the system.
I hope Domino getting 3 PP's out of it balances it out. She can of course spend those in the next Transition Scene for some extra dice and come back guns blazing in the next round. After all the effort she's put in to take Carnage down for good, I wouldn't expect anything less. ;)