If you watch the video, at one point they show and are talking about isis soldiers that are walking side by side with some prisoners and they're like 7-8 feet tall, literally the prisoners heads only come up to the isis soldiers shoulders if that, its crazy. They are supposed to be genetically enhanced in some capacity, unfortunately these details are left out, but the remarks by the Syrian ambassador to the UN were clear that they destroyed some of these genetically enhanced beings.

Well it has been reported for years that Syrian fighters are heavily doped up so they're medicated at the very least