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As Sam said, all the people in the canyon started seeing hallucinations a bit by bit, everything that they felt guilty for, is playing in front of their eyes.
One soldier felt saw the scene where he left his beast companion back so that he could escape safely. At this moment, the beast is coming at him, looking into his eye as if it is asking why he left the back then.
Even though he felt dazed, he couldn't find himself stopping from the hunger, but he stopped eating the soil at least and just looked at the beast in a daze.
Soon, the beast started coming at him with extreme anger as if to punish him for his deeds. The guilt made him not act at first, but soon he became enraged for some reason and started fighting back.
The same thing is happening with the rest. But for Sam and Kumar who are watching this, the people in the canyon are fighting each other.