Me and a my oversees friend were playing 2v2, he was using Sweet tooth and I was using Spike. We both used our level 3's at the same time (What are the odds?). Long story short, his level 3 basically cancelled mine, and I was left with 1 bar when his super was done.
So I guess it takes away half of what you earned because I was left with 1 super and a half.
Really? That's odd. Maybe it didn't activate your level 3 for some reason (like you lost some AP adn were just below), and it had AP left over afterwards.