Answer: A pillar fell on Meg
In Hercules' gym, Phil and Hercules were arguing over who Meg really was. Phil said she was no good, and Hercules told him to shut up, and threw Phil across the gym. Phil left, and Pegasus was distracted by another "supposed" horse. Hades appeared with Meg, and had her trapped. He made a deal with Hercules that if he would give up his strength for twenty four hours, he would let Meg go. Hercules agreed, but only under the condition that Meg wasn't hurt. While fighting a monster in Sparta, Meg knocked Hercules out of the way of a falling pillar, and the pillar landed on Meg. Meg got hurt, so Hades' deal was broken.