Ellie Aghayeva was real, and she really had been taken from her Columbia dorm. “This morning at approximately 6:30 a.m., federal agents from the Department of Homeland Security entered a Columbia Residential building and detained a student,” the university’s acting president, Claire Shipman, wrote in a statement. “Our understanding at this time is that the federal agents made misrepresentations to gain entry to the building to search for a ‘missing person.’ ” (I read these words, copied and pasted, as a disappearing Signal message, then went to the Columbia website to confirm that they were authentic.) “I’ve proposed a bill that would ban ICE from entering sensitive locations like schools and dorms,” New York’s governor, Kathy Hochul, tweeted. “Let’s get it passed now.” A rally formed outside the campus gates. “It seems real,” a lawyer friend texted me. “Habeas filed.”