Magnus is seen studying the design that was on the rooftop from which Jace had disappeared
when Alec visits him. Clary and her mother, Jocelyn, decided to stay over at Magnus' apartment
when Jace and Sebastian appeared at their house and soon, Alec, Simon and Isabelle were
staying at the apartment too. Magnus confronts Isabelle about Alec, directly telling her that he
loves Alec, telling her that he's noticed and is worried since Alec wasn't "happy.