Meela, Mathayus, Kassandra, and Khalid, went with their friends to hell to meet their respective parents and tell them how much they love them and how sorry they are for having thought the worst of them.
For the first time in their lives, they wanted to make amends for all the damage done, without knowing the truth of what had happened.
By the time they had reached the entrance to hell, the four of them knew perfectly well that they could no longer turn back and that they had to continue on their way; on the other hand, they didn't want to back down either, because they wanted to get to know their parents and the world they are currently in.