Will rides back once he realizes he and Jem have been tricked, leaving Jem to ride the carriage with only one horse, slowing him down. When Will arrives at the Institute, he's just in time to witness Thomas' death and after thanking him for everything that he has done, goes on to look for Tessa and the others. While Jem arrives, he runs straight into Nathaniel and his four clockwork automatons, two of them holding Jessamine and Sophie; one holding the Pyxis, a box that holds demon energies needed to revive the automatons.