The killing of Islamic State leader Abu Bakr al-Baghdadi is a big win for America and humanity. Still, ISIS will remain a potent threat, and will seek short term revenge.

Even as ISIS’ new leader — who may have to fight colleagues to attain his dominion — struggles to assume authority as Baghdadi’s replacement, the group’s operations officers will seek short term retribution. This threat, both directed and inspired in nature, should not be discounted as idle.