Using my best team, which is not so good as I am only at 3.5 mil GP, the battle stopped, everything exploded, the dragon came up, then crumpled to the ground. Then I got a screen that said, "VICTORY."
I submitted my score, which was only 300k, and I still had four characters left, quite capable of doing far more damage.
I don't understand this, and I am wondering if I am alone on this. It doesn't make sense. I thought I would be able to continue fighting. My lesser teams did some damage until they all died.