It’s essentially a reflection of how Walker feels in that situation. You’re pretty much supposed to feel like you didn’t have a choice because at the same time that’s how Walker felt.

Even though Walker did have a choice at the very beginning. He was supposed to scout the area out and return with his findings, he was never supposed to go deeper into Dubai like he did. But at every step he convinced himself that he had no choice but to do so. Culminating in the white phosphorus event.