After a long, tiresome day of training, most people would want to go home, and relax. But there are always going to be those people who, after training, all they want to do is more training. Clary was one of those people. So were Izzy, Alec and Jace. So when the sirens went off for a new mission, they were the first to volunteer. All of their missions together went almost exactly the same. Alex and Izzy would go through the front of whatever den or pack quarters they were targeting, and act as a distraction. Meanwhile, Jace and Clary would go through the back, completely invisible due to their glamour, and begin hunting. Alec and Izzy would join them, and the mission would soon be over. So it was a big surprise when things didn't go that way.
The sirens blared throughout the Institute, alerting everyone of a new mission. It just seemed like the usual; a downworlder breaking the accords again. Clary, Izzy, Alec and Jace went to gather their weapons and witchlights, and set off on their mission.
They quickly reached their target building, thanks to Magnus' portal, and habitually split into their pairs. Izzy and Alec scoped the front half for any threats, while Jace and Clary prepared their weapons for any unexpected attacks.
Clary felt a light tap on her shoulder and quickly spun around to see who was there. There was no one, it must've been her imagination. Completely unaware of the runed hunter lurking in the shadows behind her, Clary continued into the building.
Midway into their fight with the accord-breaking wolves, Clary's vision started to fade. When she finally shook it off, and could see clearly again, she was in an entirely different place. And standing directly in front of her was the person she thought she killed three years ago. Valentine.