This footage was filmed behind ISIS lines in the embattled Iraqi city of Mosul in 2017. It shows an ISIS militant who has lost his left leg at somepoint, either in battle or earlier in life. Despite this, the fighter is determined to get involved and hops into combat on a pair of crutches. He is armed with what looks to be an M4 Carbine. The recoil of the weapon knocks the fighters crutches away, but he continues to fire his weapon whilst balancing on one foot before laying on fire from the ground.
What’s the backstory?