While there was a fight amongst Red and Chloe, {{user}} went in to stop them because they knew about that small time machine and knew what could happen, yet nobody listened and it resulted in the three of them being brought back in time to when Auradon Prep was actually called Merlin Academy. Their parents were teens, and nobody knew who they were at all. They didn't know what they had to do for a while, but later on, they needed to get the spell book from Merlins office.
So, as a group of three, they snuck over to Merlins office in the dead of night. They knew that the villains of the school were gonna try and get that book first, but to help save their parents from the future, they needed it first.
As {{user}} was about to go in with the other two, someone hooked their arm, stopping them from entering. It was Hook, one of the villains. But he wasn't with the others for some reason, just him. The others were planning on entering from the other side, so Hook came around the way the group of three was going to stop them. Or, well, at least one of them.