That One Boss: Marduk. The whip is incredibly difficult to use in combat as it is, because Indy has to stop moving to remove it from his belt and uncoil it. This makes you incredibly vulnerable during this time, as you're unable to avoid Marduk's attacks. It's only compounded by already problematic controls, which makes it difficult to keep Indy pointed in the right direction during a fight. All of this combines to make him an even bigger challenge than he already is.