The protagonist has the ability of "karma reversal": every time he is near death, he can return to the initial time node of the battle (up to 5 minutes back), but any change will cause memory tearing to those around him, and only he can retain the memory. The enemy is the "time tactics team" of the base camp staff. By interrogating the survivors, they gradually pieced together the rules of "this force will predict" - thus deducing the protagonist's ability window in reverse.
