The Taliban’s lightning offensive in Afghanistan has sent shockwaves across the world. Even the fighters themselves, many experts say, did not expect the group to win this quickly. The deadly explosions at Kabul airport on Thursday are an alarming sign of the chaos that is likely to ensue in the wake of their victory. Of course, the Taliban were not responsible for the attack. Rather, it was the work of one of their sworn enemies: ISIS-K, an ISIS affiliate operating in Afghanistan and Pakistan, whose members include some disaffected former Taliban fighters. But it doesn’t bode well for the future of Afghanistan under Taliban rule.