Puts two finished cards head to head without manufacturing balance.
Takes two completed battle cards and writes how each wins over the other, the conditions that favor one side, the zone where they overlap, and a neutral verdict. The two win-path sections are not padded to equal length where the evidence does not support it.
Runs on the output of the battle card work rather than feeding into it, which is what makes it an optional step. A comparison that manufactures a tidy each-wins-some balance is a comfortable lie.
What it needs, and which agents use what it produces.